SEP_INST.LOG:

MSI (s) (DC:0C) [10:01:50:831]: Executing op: ProgressTotal(Total=1,Type=1,ByteEquivalent=1300000)
MSI (s) (DC:0C) [10:01:50:831]: Executing op: ServiceControl(,Name=SepMasterService,Action=1,Wait=1,)
MSI (s) (DC:0C) [10:01:52:002]: Executing op: ActionStart(Name=ShowServiceProgress_RB,Description=Executing rollback script via service,Template=[1])
MSI (s) (DC:0C) [10:01:52:002]: Executing op: CustomActionSchedule(Action=ShowServiceProgress_RB,ActionType=3329,Source=BinaryData,Target=ShowServiceProgress_RB,CustomActionData={A4C6A6D3-7221-458F-A52B-BA6011F550EF};SOFTWARE\Symantec\Symantec Endpoint Protection;Executing rollback script via service;)
MSI (s) (DC:0C) [10:01:52:049]: Executing op: ActionStart(Name=ShowServiceProgress,Description=Executing install script via service,Template=[1])
MSI (s) (DC:0C) [10:01:52:049]: Executing op: CustomActionSchedule(Action=ShowServiceProgress,ActionType=3073,Source=BinaryData,Target=ShowServiceProgress,CustomActionData={A4C6A6D3-7221-458F-A52B-BA6011F550EF};SOFTWARE\Symantec\Symantec Endpoint Protection;Executing install script via service;)
MSI (s) (DC:C0) [10:01:52:096]: Invoking remote custom action. DLL: C:\WINDOWS\Installer\MSICC.tmp, Entrypoint: ShowServiceProgress
ScriptGen: ShowServiceProgress() MSIRUNMODE_SCHEDULED
ScriptGen: ShowServiceProgress() calling WaitForSingleObject(scriptStarted) ...
ScriptGen: ShowServiceProgress() WaitForSingleObject(scriptStarted) returned WAIT_OBJECT_0
ScriptGen: ShowServiceProgress() script execution failed.
ScriptGen: ShowServiceProgress() reset script failure event.
ScriptGen: ShowServiceProgress() is returning an error (so close to the end!)
MSI (s) (DC:0C) [10:02:11:737]: User policy value 'DisableRollback' is 0
MSI (s) (DC:0C) [10:02:11:737]: Machine policy value 'DisableRollback' is 0
Action ended 10:02:11: InstallFinalize. Return value 3.
MSI (s) (DC:0C) [10:02:11:752]: Executing op: Header

SIS_INST.LOG:

2011-09-22T14:02:11.565Z INFO  I SIS    Executing action ( 307 ) - CreateShortcut  currentPosition: 144824
2011-09-22T14:02:11.565Z DEBUG I SIS      DeleteFileAction: target does not exist: C:\Documents and Settings\All Users\Start Menu\Programs\Symantec Endpoint Protection\Symantec Endpoint Protection.lnk
2011-09-22T14:02:11.565Z ERROR I SIS      Failed to acquire shell interface.
2011-09-22T14:02:11.565Z ERROR I SIS        
2011-09-22T14:02:11.565Z ERROR I SIS        This action failed to execute!  Dumping action paramters from the script:
2011-09-22T14:02:11.565Z ERROR I SIS          ShortcutPath=[C:\Documents and Settings\All Users\Start Menu\Programs\Symantec Endpoint Protection\Symantec Endpoint Protection.lnk]
2011-09-22T14:02:11.565Z ERROR I SIS          Target=[C:\Program Files\Symantec\Symantec Endpoint Protection\12.1.671.4971.105\Bin\SymCorpUI.exe]
2011-09-22T14:02:11.565Z ERROR I SIS          TargetDirectory=[]
2011-09-22T14:02:11.565Z ERROR I SIS          Arguments=[]
2011-09-22T14:02:11.565Z ERROR I SIS          IconFile=[]
2011-09-22T14:02:11.565Z ERROR I SIS          IconIndex=[0]
2011-09-22T14:02:11.565Z INFO  I SIS        ExecuteScript() - Successfully set failure event.
2011-09-22T14:02:11.565Z INFO  I SIS    ExecuteScript() returning ACTION_FAILED_WITH_ROLLBACK
2011-09-22T14:02:11.565Z INFO  I SIS  
2011-09-22T14:02:11.565Z INFO  I SIS  script completed with status: ACTION_FAILED_WITH_ROLLBACK
2011-09-22T14:02:11.565Z INFO  r SIS  TransitionToEnteringRollbackScript() - success
2011-09-22T14:02:11.565Z INFO  r SIS    
2011-09-22T14:02:11.565Z INFO  r SIS    starting execution of script: C:\Program Files\Symantec\Symantec Endpoint Protection\12.1.671.4971.105\Scripts\startrollback.sis