Hi, my SEP11 kept rolling back in the installation stage, I have googled around and have followed many of the steps provided here, and I still couldn't figure out why. Please advise.

Some background info:
1. I have previously installed a SEP11 and have manually uninstalled it following the long steps provided by Symantec (i have already deleted all the registry values listed on the manual installation steps)

2. I have already deleted all SEP and LiveUpdate related folders in

C:\Documents and Settings\All Users\Application Data\Symantec\LiveUpdate
C:\Program Files\Symantec
C:\Program Files\Symantec antivirus

3. I have used MS Installer Clean Up Utility to remove the remaining of the SEP
4. I am a student and have a sep11.exe, one file installation version provided by my school

5. "Return Value 3" occured in TWO instances in my SEP_INST.log. Here's the last few lines in the SEP_INST.log before return value 3:
Instance #1:
MSIRESULT PASS - MsiHelper::CMsiDefRegArchive::Init: Start Initialization:
MSIRESULT PASS - MsiHelper::CMsiDefRegArchive::Init: Getting custom action data:
MSIRESULT PASS - MsiHelper::CMsiDefRegArchive::Init: szFileName == 'C:\DOCUME~1\Owner\LOCALS~1\Temp\CCI43.tmp':
MSIRESULT PASS - MsiHelper::CMsiDefRegArchive::Init: Parsing data:
MSIRESULT PASS - MsiHelper::CMsiDefRegArchive::Init: End Initialization:
2009-11-18-02-55-57-000 : cc::CServiceControl::WaitForService(86) : Allocated 186 bytes
2009-11-18-02-55-57-000 : cc::CServiceControl::WaitForService(112) : Waiting for Event Log service to start.
2009-11-18-02-55-57-000 : cc::CServiceControl::WaitForService(129) : Service status is set to 1
2009-11-18-02-55-57-015 : cc::CServiceControl::WaitForService(182) : Service status before exit 1
MSIASSERT - 2009-11-18-02-55-57-015 : cc::CServiceControl::WaitForService(188) :  Service status is incorrect. Returning false:
MSIASSERT - StartEventLogService: WaitForService failed:
MSI (s) (24:D4) [02:55:57:031]: User policy value 'DisableRollback' is 0
MSI (s) (24:D4) [02:55:57:031]: Machine policy value 'DisableRollback' is 0
Action ended 2:55:57: InstallFinalize. Return value 3.

Instance #2:
MSI (s) (24:D4) [02:56:32:234]: Executing op: ActionStart(Name=checkMSXMLVersion.0723A1DC_DEB6_4A50_874F_3A2D2C99A1C1,,)
MSI (s) (24:D4) [02:56:32:234]: Executing op: ActionStart(Name=RB_cleanupFolder.0723A1DC_DEB6_4A50_874F_3A2D2C99A1C1,,)
MSI (s) (24:D4) [02:56:32:234]: Executing op: CustomActionRollback(Action=RB_cleanupFolder.0723A1DC_DEB6_4A50_874F_3A2D2C99A1C1,ActionType=1345,Source=BinaryData,Target=cleanupFolder,)
MSI (s) (24:F0) [02:56:32:265]: Invoking remote custom action. DLL: C:\WINDOWS\Installer\MSIB6.tmp, Entrypoint: cleanupFolder
InstSymProtect::cleanupFolder() -> called
DeleteFolderIfNoFileExists: Driver file is present. Not deleting folder.
MSI (s) (24:D4) [02:56:32:515]: Executing op: End(Checksum=0,ProgressTotalHDWord=0,ProgressTotalLDWord=0)
MSI (s) (24:D4) [02:56:32:515]: Error in rollback skipped.    Return: 5
cleanupFolder:  exiting
MSI (s) (24:D4) [02:56:32:531]: Calling SRSetRestorePoint API. dwRestorePtType: 13, dwEventType: 103, llSequenceNumber: 821, szDescription: "".
MSI (s) (24:D4) [02:56:32:562]: The call to SRSetRestorePoint API succeeded. Returned status: 0.
MSI (s) (24:D4) [02:56:32:562]: Unlocking Server
MSI (s) (24:D4) [02:56:32:578]: PROPERTY CHANGE: Deleting UpdateStarted property. Its current value is '1'.
Action ended 2:56:32: INSTALL. Return value 3.

The full SEP_INST.log is zipped and attached for your perusal.
Please help and thanks in advance!