Had SEP11 installed, but LiveUpdate stopped working.
So did an uninstall ...

Then used Norton Removal Tool etc.

Now re-install of SEP11 does not work as per post above.

Will appreciate any help

Is there a SEP11 removal tool ?

one of the sections in the MSI1a9c5 (SEP_log) is

LUCA: InstallLiveUpdate enter.
MSI (s) (D0:D8) [01:17:42:321]: Closing MSIHANDLE (5257) of type 790531 for thread 3800
MSI (s) (D0:D8) [01:17:42:321]: Creating MSIHANDLE (5258) of type 790531 for thread 3800
LUCA: C:\Users\ANIL~1.HP-\AppData\Local\Temp\RPJRVSPP\LiveUpdate\lucheck.exe
MSI (s) (D0:D8) [01:17:42:321]: Closing MSIHANDLE (5258) of type 790531 for thread 3800
MSI (s) (D0:D8) [01:18:10:526]: Creating MSIHANDLE (5259) of type 790531 for thread 3800
LUCA: InstallLiveUpdate : CreateProcessAndWait( LUCHECK.EXE ) returned 206
MSI (s) (D0:D8) [01:18:10:526]: Closing MSIHANDLE (5259) of type 790531 for thread 3800
CustomAction InstallLiveUpdate.479D9157_6569_48B2_97C9_6F35A45064AC returned actual error code 1603 (note this may not be 100% accurate if translation happened inside sandbox)
MSI (s) (D0:E0) [01:18:10:526]: Closing MSIHANDLE (5256) of type 790536 for thread 4284
Action ended 1:18:10: InstallFinalize. Return value 3.

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Another section with return value 3 ...

MSI (s) (D0:BC) [01:18:40:556]: Entering MsiProvideAssembly. AssemblyName: Microsoft.VC80.MFC,type="win32",version="8.0.50727.762",publicKeyToken="1fc8b3b9a1e18e3b",processorArchitecture="x86", AppContext: , InstallMode: -4
MSI (s) (D0:BC) [01:18:40:556]: Pathbuf: 0, pcchPathBuf: 0
MSI (s) (D0:BC) [01:18:40:571]: MsiProvideAssembly is returning: 1607
MSI (s) (D0:BC) [01:18:40:961]: Note: 1: 2318 2:  
MSI (s) (D0:BC) [01:18:40:961]: Calling SRSetRestorePoint API. dwRestorePtType: 13, dwEventType: 103, llSequenceNumber: 63, szDescription: "".
MSI (s) (D0:BC) [01:18:40:977]: The call to SRSetRestorePoint API succeeded. Returned status: 0.
MSI (s) (D0:BC) [01:18:40:977]: Unlocking Server
MSI (s) (D0:BC) [01:18:41:024]: PROPERTY CHANGE: Deleting UpdateStarted property. Its current value is '1'.
Action ended 1:18:41: INSTALL. Return value 3.

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Last section with Return Value 3.

Property(S): MSIRemoveWFPAppException_RB.1CBEC0D3_E547_4E51_828B_44B9C47C0EA5 = SMC Service;C:\Program Files (x86)\Symantec\Symantec Endpoint Protection\Smc.exe;SNAC64 Service;C:\Program Files (x86)\Symantec\Symantec Endpoint Protection\SNAC64.EXE;Symantec Email;C:\Program Files (x86)\Common Files\Symantec Shared\ccApp.exe;
Property(S): MSIRemoveWFPAppException.1CBEC0D3_E547_4E51_828B_44B9C47C0EA5 = SMC Service;C:\Program Files (x86)\Symantec\Symantec Endpoint Protection\Smc.exe;SNAC64 Service;C:\Program Files (x86)\Symantec\Symantec Endpoint Protection\SNAC64.EXE;Symantec Email;C:\Program Files (x86)\Common Files\Symantec Shared\ccApp.exe;
Property(S): MSIAddWFPAppException_RB.1CBEC0D3_E547_4E51_828B_44B9C47C0EA5 = SMC Service;C:\Program Files (x86)\Symantec\Symantec Endpoint Protection\Smc.exe;SNAC64 Service;C:\Program Files (x86)\Symantec\Symantec Endpoint Protection\SNAC64.EXE;Symantec Email;C:\Program Files (x86)\Common Files\Symantec Shared\ccApp.exe;
MSI (s) (D0:BC) [01:18:41:460]: MainEngineThread is returning 1603
MSI (s) (D0:E4) [01:18:41:460]: User policy value 'DisableRollback' is 0
MSI (s) (D0:E4) [01:18:41:460]: Machine policy value 'DisableRollback' is 0
MSI (s) (D0:E4) [01:18:41:460]: Incrementing counter to disable shutdown. Counter after increment: 0
MSI (s) (D0:E4) [01:18:41:460]: Note: 1: 1402 2: HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Installer\Rollback\Scripts 3: 2
MSI (s) (D0:E4) [01:18:41:460]: Note: 1: 1402 2: HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Installer\Rollback\Scripts 3: 2
MSI (s) (D0:E4) [01:18:41:460]: Decrementing counter to disable shutdown. If counter >= 0, shutdown will be denied.  Counter after decrement: -1
MSI (s) (D0:E4) [01:18:41:460]: Restoring environment variables
MSI (s) (D0:E4) [01:18:41:460]: Destroying RemoteAPI object.
MSI (s) (D0:48) [01:18:41:460]: Custom Action Manager thread ending.
MSI (c) (5C:94) [01:18:41:460]: Back from server. Return value: 1603
MSI (c) (5C:94) [01:18:41:460]: Decrementing counter to disable shutdown. If counter >= 0, shutdown will be denied.  Counter after decrement: -1
MSI (c) (5C:94) [01:18:41:460]: PROPERTY CHANGE: Deleting SECONDSEQUENCE property. Its current value is '1'.
Action ended 1:18:41: ExecuteAction. Return value 3.
MSI (c) (5C:94) [01:18:41:460]: Doing action: SetupCompleteError
Action 1:18:41: SetupCompleteError.
Action start 1:18:41: SetupCompleteError.
Action 1:18:41: SetupCompleteError. Dialog created
Action ended 1:18:47: SetupCompleteError. Return value 2.
Action ended 1:18:47: INSTALL. Return value 3.

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End comments ....

Property(C): MsiLogFileLocation = C:\Users\A~1.HP-\AppData\Local\Temp\MSI1a9c5.LOG
Property(C): SourcedirProduct = {530992D4-DDBA-4F68-8B0D-FF50AC57531B}
Property(C): CLIENT_LANGUAGE = English
Property(C): FEATURESTATECHANGE = 1
Property(C): OutOfDiskSpace = 0
Property(C): OutOfNoRbDiskSpace = 0
Property(C): PrimaryVolumeSpaceAvailable = 0
Property(C): PrimaryVolumeSpaceRequired = 0
Property(C): PrimaryVolumeSpaceRemaining = 0
=== Logging stopped: 7/17/2010  1:18:47 ===
MSI (c) (5C:94) [01:18:47:669]: Note: 1: 1708
MSI (c) (5C:94) [01:18:47:669]: Product: Symantec Endpoint Protection -- Installation operation failed.

MSI (c) (5C:94) [01:18:47:685]: Windows Installer installed the product. Product Name: Symantec Endpoint Protection. Product Version: 11.0.5002.333. Product Language: 1033. Manufacturer: Symantec Corporation. Installation success or error status: 1603.

MSI (c) (5C:94) [01:18:47:685]: Grabbed execution mutex.
MSI (c) (5C:94) [01:18:47:685]: Cleaning up uninstalled install packages, if any exist
MSI (c) (5C:94) [01:18:47:685]: MainEngineThread is returning 1603
=== Verbose logging stopped: 7/17/2010  1:18:47 ===

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Thanks

Delete following folders if present
C:\Program Files\Symantec
C:\Program Data\Symantec
C:\Program Files\Symantec AntiVirus
C:\Program Files\Common Files\Symantec Shared
C:\Documents and Settings\All Users\Application Data\Symantec
 
Also delete following reg keys
HKLM\Software\symantec
HKCU\Software\symantec
Install SEP and try..

If not helps pls attach the SEP_inst.log which will be present in %temp%.Which is the OS?

Installation of Symantec Endpoint Protection Client rolls back with error LUCHECK.EXE returned 206