It looks like a custom action is running during uninstall that should not run during uninstall.
You should generate a verbose log of the uninstall and find out which action is causing the error, and then apply a condition of "NOT Installed" to this action.
Also, it helps us if you include in your postings which Wise tool you are working with, and which operating system you are testing on.

Hi thanks for you reply.

I'm working on a Windows XP SP2 environment. With Wise Package Studio version 7 sp1.

I know where the problem exist in the script and i have already used the NOT installed condition to fix it.
The problem exist in the execute deffered part:

There are 5 rows for the native code versioning of dll files like this:

$System.Runtime.Remoting.ni.dll=2
WiseDotNetUnGenerate.System.Runtime.Remoting.ni.dll

Removing the generate native code checkbox on these files also fix the problem, but i was wondering why it says generate native code during installation, and then the error comes during uninstallation of the package.

Here is a part of the uninstall log where the error appears:
------------
MSI (s) (C4:0C) [08:02:17:796]: Leaked MSIHANDLE (51) of type 790531 for thread 3088
MSI (s) (C4:0C) [08:02:17:796]: Leaked MSIHANDLE (50) of type 790531 for thread 3088
MSI (s) (C4:0C) [08:02:17:796]: Leaked MSIHANDLE (49) of type 790531 for thread 3088
MSI (s) (C4:0C) [08:02:17:796]: Leaked MSIHANDLE (48) of type 790531 for thread 3088
MSI (s) (C4:0C) [08:02:17:796]: Leaked MSIHANDLE (47) of type 790531 for thread 3088
MSI (s) (C4:0C) [08:02:17:796]: Note: 1: 2769 2: WiseSetAssemblyFrameworkProperties 3: 22
Action start 8:02:17: WiseSetAssemblyFrameworkProperties.
DEBUG: Error 2769:  Custom Action WiseSetAssemblyFrameworkProperties did not close 22 MSIHANDLEs.
Internal Error 2769. WiseSetAssemblyFrameworkProperties, 22
MSI (s) (C4:54) [08:02:17:796]: Skipping action: AllocateRegistrySpace (condition is false)
MSI (s) (C4:54) [08:02:17:796]: Doing action: ProcessComponents
Action ended 8:02:17: WiseSetAssemblyFrameworkProperties. Return value 1.
Action start 8:02:17: ProcessComponents.
MSI (s) (C4:54) [08:02:17:906]: Doing action: UnpublishComponents
Action ended 8:02:17: ProcessComponents. Return value 1.
MSI (s) (C4:54) [08:02:17:906]: Note: 1: 2262 2: PublishComponent 3: -2147287038
Action start 8:02:17: UnpublishComponents.
MSI (s) (C4:54) [08:02:17:906]: Doing action: MsiUnpublishAssemblies
Action ended 8:02:17: UnpublishComponents. Return value 1.
Action start 8:02:17: MsiUnpublishAssemblies.
MSI (s) (C4:54) [08:02:17:937]: Doing action: UnpublishFeatures
Action ended 8:02:17: MsiUnpublishAssemblies. Return value 1.
Action start 8:02:17: UnpublishFeatures.
MSI (s) (C4:54) [08:02:17:953]: Doing action: WiseDotNetGenSetUnProperty.System.Data.SqlXml.ni.dll
Action ended 8:02:17: UnpublishFeatures. Return value 1.
MSI (s) (C4:54) [08:02:17:953]: PROPERTY CHANGE: Adding WiseDotNetUnGenerate.System.Data.SqlXml.ni.dll property. Its value is '|/nologo /silent /delete "C:\WINDOWS\assembly\GAC\System.Data.SqlXml\2.0.0.0__b77a5c561934e089\System.Data.SqlXml.ni.dll"'.
Action start 8:02:17: WiseDotNetGenSetUnProperty.System.Data.SqlXml.ni.dll.
MSI (s) (C4:54) [08:02:17:953]: Doing action: WiseDotNetUnGenerate.System.Data.SqlXml.ni.dll
Action ended 8:02:17: WiseDotNetGenSetUnProperty.System.Data.SqlXml.ni.dll. Return value 1.
Action start 8:02:17: WiseDotNetUnGenerate.System.Data.SqlXml.ni.dll.
MSI (s) (C4:54) [08:02:17:953]: Doing action: WiseDotNetGenSetUnProperty.System.Runtime.Remoting.ni.dll
Action ended 8:02:17: WiseDotNetUnGenerate.System.Data.SqlXml.ni.dll. Return value 1.
MSI (s) (C4:54) [08:02:17:953]: PROPERTY CHANGE: Adding WiseDotNetUnGenerate.System.Runtime.Remoting.ni.dll property. Its value is '|/nologo /silent /delete "C:\WINDOWS\assembly\GAC\System.Runtime.Remoting\2.0.0.0__b77a5c561934e089\System.Runtime.Remoting.ni"'.
Action start 8:02:17: WiseDotNetGenSetUnProperty.System.Runtime.Remoting.ni.dll.
MSI (s) (C4:54) [08:02:17:953]: Doing action: WiseDotNetUnGenerate.System.Runtime.Remoting.ni.dll
Action ended 8:02:17: WiseDotNetGenSetUnProperty.System.Runtime.Remoting.ni.dll. Return value 1.
Action start 8:02:17: WiseDotNetUnGenerate.System.Runtime.Remoting.ni.dll.
MSI (s) (C4:54) [08:02:17:953]: Doing action: WiseDotNetGenSetUnProperty.Microsoft.VisualC.ni.dll
Action ended 8:02:17: WiseDotNetUnGenerate.System.Runtime.Remoting.ni.dll. Return value 1.
MSI (s) (C4:54) [08:02:17:953]: PROPERTY CHANGE: Adding WiseDotNetUnGenerate.Microsoft.VisualC.ni.dll property. Its value is '|/nologo /silent /delete "C:\WINDOWS\assembly\GAC\Microsoft.VisualC\8.0.0.0__b03f5f7f11d50a3a\Microsoft.VisualC.ni.dll"'.
Action start 8:02:17: WiseDotNetGenSetUnProperty.Microsoft.VisualC.ni.dll.
MSI (s) (C4:54) [08:02:17:953]: Doing action: WiseDotNetUnGenerate.Microsoft.VisualC.ni.dll
Action ended 8:02:17: WiseDotNetGenSetUnProperty.Microsoft.VisualC.ni.dll. Return value 1.
Action start 8:02:17: WiseDotNetUnGenerate.Microsoft.VisualC.ni.dll.
MSI (s) (C4:54) [08:02:17:953]: Doing action: WiseDotNetGenSetUnProperty.System.Data.OracleClient.ni.dll
Action ended 8:02:17: WiseDotNetUnGenerate.Microsoft.VisualC.ni.dll. Return value 1.
MSI (s) (C4:54) [08:02:17:953]: PROPERTY CHANGE: Adding WiseDotNetUnGenerate.System.Data.OracleClient.ni.dll property. Its value is 'v2.0.50727|/nologo /silent /delete "C:\WINDOWS\assembly\GAC\System.Data.OracleClient\2.0.0.0__b77a5c561934e089\System.Data.OracleClient.ni.dll"'.
Action start 8:02:17: WiseDotNetGenSetUnProperty.System.Data.OracleClient.ni.dll.
MSI (s) (C4:54) [08:02:17:953]: Doing action: WiseDotNetUnGenerate.System.Data.OracleClient.ni.dll
Action ended 8:02:17: WiseDotNetGenSetUnProperty.System.Data.OracleClient.ni.dll. Return value 1.
Action start 8:02:17: WiseDotNetUnGenerate.System.Data.OracleClient.ni.dll.
MSI (s) (C4:54) [08:02:17:953]: Doing action: WiseDotNetGenSetUnProperty.System.Configuration.Install.ni.dll
Action ended 8:02:17: WiseDotNetUnGenerate.System.Data.OracleClient.ni.dll. Return value 1.
MSI (s) (C4:54) [08:02:17:968]: PROPERTY CHANGE: Adding WiseDotNetUnGenerate.System.Configuration.Install.ni.dll property. Its value is '|/nologo /silent /delete "C:\WINDOWS\assembly\GAC\System.Configuration.Install\2.0.0.0__b03f5f7f11d50a3a\System.Configuration.Install"'.
Action start 8:02:17: WiseDotNetGenSetUnProperty.System.Configuration.Install.ni.dll.
MSI (s) (C4:54) [08:02:17:968]: Doing action: WiseDotNetUnGenerate.System.Configuration.Install.ni.dll
Action ended 8:02:17: WiseDotNetGenSetUnProperty.System.Configuration.Install.ni.dll. Return value 1.
Action start 8:02:17: WiseDotNetUnGenerate.System.Configuration.Install.ni.dll.
MSI (s) (C4:54) [08:02:17:968]: Doing action: StopServices
Action ended 8:02:17: WiseDotNetUnGenerate.System.Configuration.Install.ni.dll. Return value 1.
MSI (s) (C4:54) [08:02:17:968]: Note: 1: 2262 2: ServiceControl 3: -2147287038
Action start 8:02:17: StopServices.
-----------------

Thanks for you help,
Tom

Apart from the various comments about leaked and non released handles, which are not uncommon in MSI logs, I cannot see any errors in the log segment you have posted. 
Return Value 1 signifies an error free return from an action.
Generally, any action which encounters an error during execution has a Return Value 3 associated with it.
May I suggest you have a search in the full log for any instances of Return Value 3 as this may better identify where the problem lies.

Here it is:

MSI (s) (C4:54) [08:02:19:140]: Note: 1: 1402 2: UNKNOWN\Installer\Assemblies\C:|Program Files|SCIA|Engineer2010.0|Addons|Scia2Etabs.exe 3: 2
MSI (s) (C4:54) [08:02:19:140]: Note: 1: 1402 2: UNKNOWN\Installer\Assemblies\C:|Program Files|SCIA|Engineer2010.0|Addons|Scia2Etabs.exe 3: 2
MSI (s) (C4:54) [08:02:19:140]: Executing op: AssemblyUnpublish(,,AssemblyType=3,AppCtx=C:\Program Files\SCIA\Engineer2010.0\Addons\SciaOpenInterface.dll,AssemblyName=SciaOpenInterface,Version="1.0.2.10",RuntimeVersion="v2.0.50727",PublicKeyToken="null",processorArchitecture="MSIL",GUID="cee30d88-ea40-4a75-b659-e9b14da126c8",Culture="neutral",Descriptor=%jft-T56!=!Dw$)$8I7]>Tm)~4yGdK9j@NsG_'cwh)
MSI (s) (C4:54) [08:02:19:140]: Note: 1: 1402 2: UNKNOWN\Installer\Assemblies\C:|Program Files|SCIA|Engineer2010.0|Addons|SciaOpenInterface.dll 3: 2
MSI (s) (C4:54) [08:02:19:140]: Note: 1: 1402 2: UNKNOWN\Installer\Assemblies\C:|Program Files|SCIA|Engineer2010.0|Addons|SciaOpenInterface.dll 3: 2
MSI (s) (C4:54) [08:02:19:140]: Executing op: AssemblyUnpublish(,,AssemblyType=3,AppCtx=C:\Program Files\SCIA\Engineer2010.0\EsaSwccLink.dll,AssemblyName=EsaSwccLink,Version="0.0.0.0",RuntimeVersion="v2.0.50727",PublicKeyToken="null",processorArchitecture="X86",Culture="neutral",Descriptor=%jft-T56!=!Dw$)$8I7]>wacS%}n9Z@np6!$r8@(K)
MSI (s) (C4:54) [08:02:19:140]: Note: 1: 1402 2: UNKNOWN\Installer\Assemblies\C:|Program Files|SCIA|Engineer2010.0|EsaSwccLink.dll 3: 2
MSI (s) (C4:54) [08:02:19:140]: Note: 1: 1402 2: UNKNOWN\Installer\Assemblies\C:|Program Files|SCIA|Engineer2010.0|EsaSwccLink.dll 3: 2
MSI (s) (C4:54) [08:02:19:140]: Executing op: AssemblyUnpublish(,,AssemblyType=3,AppCtx=C:\Program Files\SCIA\Engineer2010.0\Addons\SEnMapDbEditor.exe,AssemblyName=SEnMapDbEditor,Version="1.0.2.3",RuntimeVersion="v2.0.50727",PublicKeyToken="null",processorArchitecture="MSIL",GUID="c40fd20c-694d-4bfc-abbb-075f185b2936",Culture="neutral",Descriptor=%jft-T56!=!Dw$)$8I7]>f*3d+Y3!m8rZIDJM?29Y)
MSI (s) (C4:54) [08:02:19:140]: Note: 1: 1402 2: UNKNOWN\Installer\Assemblies\C:|Program Files|SCIA|Engineer2010.0|Addons|SEnMapDbEditor.exe 3: 2
MSI (s) (C4:54) [08:02:19:140]: Note: 1: 1402 2: UNKNOWN\Installer\Assemblies\C:|Program Files|SCIA|Engineer2010.0|Addons|SEnMapDbEditor.exe 3: 2
MSI (s) (C4:54) [08:02:19:140]: Executing op: AssemblyUnpublish(,,AssemblyType=3,AppCtx=C:\Program Files\SCIA\Engineer2010.0\EsaCCDLink.dll,AssemblyName=EsaCCDLink,Version="0.0.0.0",RuntimeVersion="v2.0.50727",PublicKeyToken="null",processorArchitecture="X86",Culture="neutral",Descriptor=%jft-T56!=!Dw$)$8I7]>pMc}9zdnWA?I&gkHVs4m)
MSI (s) (C4:54) [08:02:19:140]: Note: 1: 1402 2: UNKNOWN\Installer\Assemblies\C:|Program Files|SCIA|Engineer2010.0|EsaCCDLink.dll 3: 2
MSI (s) (C4:54) [08:02:19:140]: Note: 1: 1402 2: UNKNOWN\Installer\Assemblies\C:|Program Files|SCIA|Engineer2010.0|EsaCCDLink.dll 3: 2
MSI (s) (C4:54) [08:02:19:140]: Executing op: AssemblyUnpublish(,,AssemblyType=3,AppCtx=C:\Program Files\SCIA\Engineer2010.0\Addons\Scia2Tekla.exe,AssemblyName=Scia2Tekla,Version="2.0.2.4",RuntimeVersion="v2.0.50727",PublicKeyToken="null",processorArchitecture="MSIL",GUID="7b0e49d2-dc60-4c26-b09a-4589cadb3b39",Culture="neutral",Descriptor=%jft-T56!=!Dw$)$8I7]>VcA$@6W8CAM'L`yCohw))
MSI (s) (C4:54) [08:02:19:140]: Note: 1: 1402 2: UNKNOWN\Installer\Assemblies\C:|Program Files|SCIA|Engineer2010.0|Addons|Scia2Tekla.exe 3: 2
MSI (s) (C4:54) [08:02:19:140]: Note: 1: 1402 2: UNKNOWN\Installer\Assemblies\C:|Program Files|SCIA|Engineer2010.0|Addons|Scia2Tekla.exe 3: 2
MSI (s) (C4:54) [08:02:19:140]: Executing op: AssemblyUnpublish(,,AssemblyType=3,AppCtx=C:\Windows\WinSxS\x86_Microsoft.VC80.CRT_1fc8b3b9a1e18e3b_8.0.50727.4053_x-ww_e6967989\msvcm80.dll,AssemblyName=msvcm80,Version="8.0.50727.4053",RuntimeVersion="v2.0.50727",PublicKeyToken="b03f5f7f11d50a3a",processorArchitecture="X86",Culture="neutral",Descriptor=%jft-T56!=!Dw$)$8I7]>d_vTn~zA6@uV6Q7e0?j8)
MSI (s) (C4:54) [08:02:19:140]: Note: 1: 1402 2: UNKNOWN\Installer\Assemblies\C:|Windows|WinSxS|x86_Microsoft.VC80.CRT_1fc8b3b9a1e18e3b_8.0.50727.4053_x-ww_e6967989|msvcm80.dll 3: 2
MSI (s) (C4:54) [08:02:19:140]: Note: 1: 1402 2: UNKNOWN\Installer\Assemblies\C:|Windows|WinSxS|x86_Microsoft.VC80.CRT_1fc8b3b9a1e18e3b_8.0.50727.4053_x-ww_e6967989|msvcm80.dll 3: 2
MSI (s) (C4:54) [08:02:19:140]: Executing op: AssemblyUnpublish(,,AssemblyType=3,AppCtx=C:\Program Files\SCIA\Engineer2010.0\Addons\Scia2SDNF.exe,AssemblyName=Scia2SDNF,Version="1.0.1.8",RuntimeVersion="v2.0.50727",PublicKeyToken="null",processorArchitecture="MSIL",GUID="446edce6-b506-4a6d-acbb-fc4f5e5a3985",Culture="neutral",Descriptor=%jft-T56!=!Dw$)$8I7]>Ny*i-T=[MAk6zIdQ_yma)
MSI (s) (C4:54) [08:02:19:140]: Note: 1: 1402 2: UNKNOWN\Installer\Assemblies\C:|Program Files|SCIA|Engineer2010.0|Addons|Scia2SDNF.exe 3: 2
MSI (s) (C4:54) [08:02:19:140]: Note: 1: 1402 2: UNKNOWN\Installer\Assemblies\C:|Program Files|SCIA|Engineer2010.0|Addons|Scia2SDNF.exe 3: 2
MSI (s) (C4:54) [08:02:19:140]: Executing op: AssemblyUnpublish(,,AssemblyType=3,AppCtx=C:\Program Files\SCIA\Engineer2010.0\SoapMan.dll,AssemblyName=SoapMan,Version="1.0.3496.24681",RuntimeVersion="v2.0.50727",PublicKeyToken="null",processorArchitecture="X86",Culture="neutral",Descriptor=%jft-T56!=!Dw$)$8I7]>goL{o+pL??$+-!$6e8iL)
MSI (s) (C4:54) [08:02:19:140]: Note: 1: 1402 2: UNKNOWN\Installer\Assemblies\C:|Program Files|SCIA|Engineer2010.0|SoapMan.dll 3: 2
MSI (s) (C4:54) [08:02:19:140]: Note: 1: 1402 2: UNKNOWN\Installer\Assemblies\C:|Program Files|SCIA|Engineer2010.0|SoapMan.dll 3: 2
MSI (s) (C4:54) [08:02:19:140]: Executing op: ActionStart(Name=UnpublishFeatures,Description=Unpublishing product features...,Template=Feature: [1])
MSI (s) (C4:54) [08:02:19:140]: Executing op: FeatureUnpublish(Feature=Complete,,Absent=2,Component==)Q}27Qgq=kXW^*0Tv}(PA,Jj~(1[AEM'oej.rfGGGaN8qt,Y=uTb,VHhgyWBOi3H(V-B9))G{nZss8xsI~D.w^W6A}hrEiv?)}PLrLe0Ih0q9d__^e[1]x$7^(.=JeE)?.RhMbT$uM_$?fE3%COQ?fb42RwnQ@1iSaKs80LCAB}YY5$Uhd9Xb^UGi`0t8.wKbm}]*TV}Ij%1%@E9?Kx~w0TzQp.?3O)olB$b?`otH'800Mc8'=HdvjNa87%-v((rZ+VY-iA,`oUH9mn'^%~.}A_+G6'xO6tl98}dv@nG0V0El])bsy,9=dG5X86cD1$*k?]*D]8N9bY4P(TK2mA5N2t9W.eK@v2TzYn~Ov)AF8RbsHCp9z?U`ny&EXjU{ZXimv9]9TL5+yFtXXk%{MF%~@oI=4s7VHZ]z_fNdi88W!Kf91SMQ`p*8@NAL`IhD)E(9'T{QtqieXnyNJ!^F+4I=6p_V%C$FIG}$=arERBa8cXyYN(R3-WG!bgC2^IR9'JiH6'mz8wE1JrNSpnG93G)lL6rDX&?Iyf1eFf%@+-+ZfGQ[u%iL!_wAJ.T9zM)a'z?O)NL'DC2xcg.@,-iFyI*7$LwFy[RMZPe=3r,`9'E@j)5j~v5TCa,AQ,Wa=aH!%J`~`%y'}Pf?c[b=ATMd0!UI),0+D!s?1TGj81sB$iV3IQ+&$ro=H[O9T~H$vYY+9u6v9I2Axv9&Xpfp%bIf[B3{Hiw@Z2k.q&?E_mNKY4G~y+r?3sl9.oF)Uk?,f6d*n`G?},xp`8*xsbqc(Q4r7uG=Yh^EVJ8kTGep,3A6!dx9BzhZoq)B_YBDmu4?[NZ?`cl_i`UpD8V3_txSEj@9PjI2P.aP?,kUu3!HZJR=bUp[r1LH1d8.,gzf$}2?5~x}Hs`J36}[]Wv+Z$K@pY%@6vUdwTD-kW4Qr?b?*9Vt`bR6%$_.^52_(Ep?LVb=&),c^oi]r-Rki+}@X@@,8?,49!eXG(WlTA5?nB?@3e8SI
MSI (s) (C4:54) [08:02:19:140]: Note: 1: 1402 2: UNKNOWN\Installer\Features\58DC2E1290965744DBD1DB21989A082A 3: 2
MSI (s) (C4:54) [08:02:19:140]: Executing op: ActionStart(Name=WiseDotNetUnGenerate.System.Data.SqlXml.ni.dll,,)
MSI (s) (C4:54) [08:02:19:140]: Executing op: CustomActionSchedule(Action=WiseDotNetUnGenerate.System.Data.SqlXml.ni.dll,ActionType=1025,Source=BinaryData,Target=ManagedGenerate,CustomActionData=|/nologo /silent /delete "C:\WINDOWS\assembly\GAC\System.Data.SqlXml\2.0.0.0__b77a5c561934e089\System.Data.SqlXml.ni.dll")
MSI (s) (C4:CC) [08:02:19:156]: Invoking remote custom action. DLL: C:\WINDOWS\Installer\MSI43.tmp, Entrypoint: ManagedGenerate
MSI (s) (C4:54) [08:02:19:156]: User policy value 'DisableRollback' is 0
MSI (s) (C4:54) [08:02:19:156]: Machine policy value 'DisableRollback' is 0
Action ended 8:02:19: InstallFinalize. Return value 3.

The part of the log that looks suspicious is:
MSI (s) (C4:54) [08:02:19:140]: Executing op: FeatureUnpublish(Feature=Complete,,Absent=2,Component==)Q}27Qgq=kXW^*0Tv}(PA,Jj~(1[AEM'oej.rfGGGaN8qt,Y=uTb,VHhgyWBOi3H(V-B9))G{nZss8xsI~D.w^W6A}hrEiv?)}PLrLe0Ih0q9d__^e[1]x$7^(.=JeE)?.RhMbT$uM_$?fE3%COQ?fb42RwnQ@1iSaKs80LCAB}YY5$Uhd9Xb^UGi`0t8.wKbm}]*TV}Ij%1%@E9?Kx~w0TzQp.?3O)olB$b?`otH'800Mc8'=HdvjNa87%-v((rZ+VY-iA,`oUH9mn'^%~.}A_+G6'xO6tl98}dv@nG0V0El])bsy,9=dG5X86cD1$*k?]*D]8N9bY4P(TK2mA5N2t9W.eK@v2TzYn~Ov)AF8RbsHCp9z?U`ny&EXjU{ZXimv9]9TL5+yFtXXk%{MF%~@oI=4s7VHZ]z_fNdi88W!Kf91SMQ`p*8@NAL`IhD)E(9'T{QtqieXnyNJ!^F+4I=6p_V%C$FIG}$=arERBa8cXyYN(R3-WG!bgC2^IR9'JiH6'mz8wE1JrNSpnG93G)lL6rDX&?Iyf1eFf%@+-+ZfGQ[u%iL!_wAJ.T9zM)a'z?O)NL'DC2xcg.@,-iFyI*7$LwFy[RMZPe=3r,`9'E@j)5j~v5TCa,AQ,Wa=aH!%J`~`%y'}Pf?c[b=ATMd0!UI),0+D!s?1TGj81sB$iV3IQ+&$ro=H[O9T~H$vYY+9u6v9I2Axv9&Xpfp%bIf[B3{Hiw@Z2k.q&?E_mNKY4G~y+r?3sl9.oF)Uk?,f6d*n`G?},xp`8*xsbqc(Q4r7uG=Yh^EVJ8kTGep,3A6!dx9BzhZoq)B_YBDmu4?[NZ?`cl_i`UpD8V3_txSEj@9PjI2P.aP?,kUu3!HZJR=bUp[r1LH1d8.,gzf$}2?5~x}Hs`J36}[]Wv+Z$K@pY%@6vUdwTD-kW4Qr?b?*9Vt`bR6%$_.^52_(Ep?LVb=&),c^oi]r-Rki+}@X@@,8?,49!eXG(WlTA5?nB?@3e8SI

The above component reference looks seriously messed up.
I also note that there are references to what looks like a visual studio runtime (Microsoft.VC80.CRT....) - I'm guessing this is the VC++ 2005 runtime. So can you tell us a bit more about what your package contains, especially if you have included any merge modules.

As far as runtimes are concerned, I would treat these as system components and mark them permanent - ie do not try and uninstall them.