SEC 5.1 to 5.2 Upgrade Failed

Hi,

I sucessfully upgraded from SEC 4.5 to 5.1 without issue and now I'm trying to go to 5.2.

The DB is on a separate server and the DB upgrade ran successfully.

I'm now trying to run the upgrade on the SEC server and the install fails at the server32.msi.

This is the end of the server32.msi log file

Property(S): DATABASE = C:\WINDOWS\Installer\1868f6.msi
Property(S): OriginalDatabase = C:\sec_52\ServerInstaller\Server32.msi
Property(S): UILevel = 2
Property(S): Preselected = 1
Property(S): ACTION = INSTALL
Property(S): DB_UPGRADE_VERSION.E96667BC_B851_472E_B9EA_5E2B142E3BFA = 51
Property(S): HASIIS4 = 1
Property(S): HASWEBSERVER = 1
Property(S): IEVERSION = 800
Property(S): OSSupportSxS = 1
Property(S): ASPNET = 4.0.30319.0
Property(S): AspNetVersionRequirementMet = 1
Property(S): DotNetFrameworkVersionRequirementMet = 1
Property(S): ROOTDRIVE = C:Property(S): CostingComplete = 1
Property(S): CRYSTALREDIRECTIONNUMBER = 2
Property(S): OutOfDiskSpace = 0
Property(S): OutOfNoRbDiskSpace = 0
Property(S): PrimaryVolumeSpaceAvailable = 0
Property(S): PrimaryVolumeSpaceRequired = 0
Property(S): PrimaryVolumeSpaceRemaining = 0
Property(S): INSTALLLEVEL = 1
MSI (s) (9C:D0) [19:30:09:490]: Note: 1: 1708 
MSI (s) (9C:D0) [19:30:09:490]: Product: Sophos Management Server -- Installation failed.

MSI (s) (9C:D0) [19:30:09:490]: Windows Installer installed the product. Product Name: Sophos Management Server. Product Version: 5.2.0. Product Language: 1033. Installation success or error status: 1603.

MSI (s) (9C:D0) [19:30:09:490]: Cleaning up uninstalled install packages, if any exist
MSI (s) (9C:D0) [19:30:09:490]: MainEngineThread is returning 1603
MSI (s) (9C:04) [19:30:09:599]: No System Restore sequence number for this installation.
=== Logging stopped: 31/01/2013  19:30:09 ===

And this is the end of the bootstrapper log file

31/01/2013 19:22:00, INFO : Start state: Idle
31/01/2013 19:22:00, INFO : Deactivate state: Idle
31/01/2013 19:22:00, INFO : Activate state: Installing
31/01/2013 19:22:00, INFO : Verifying files in folder
31/01/2013 19:22:00, INFO : Target folder verification completed successfully
31/01/2013 19:22:00, INFO : Copied SmAgentAPI.dll from C:\sec_52\ServerInstaller\pre-reqs\SmAgent\SmAgentAPI.dll into C:\Program Files\Business Objects\BusinessObjects Enterprise 11\win32_x86\plugins\auth\secLDAP\SmAgentAPI.dll
31/01/2013 19:22:00, INFO : Verifying files in folder
31/01/2013 19:22:03, INFO : Target folder verification completed successfully
31/01/2013 19:22:03, INFO : About to install Server32.msi
31/01/2013 19:30:01, INFO : Processing INSTALLMESSAGE_ERROR or INSTALLMESSAGE_FATALEXIT message from MSI
31/01/2013 19:30:01, INFO : Deactivate state: Installing
31/01/2013 19:30:01, INFO : Activate state: Failing
31/01/2013 19:30:09, INFO : Installation of Server32.msi failed with error code: 1603
31/01/2013 19:30:09, INFO : Ended installing Server32.msi
31/01/2013 19:30:11, INFO : Installation failed with error code: 1603
31/01/2013 19:30:11, INFO : Deactivate state: Failing
31/01/2013 19:30:11, INFO : Activate state: Failed
31/01/2013 19:30:11, INFO : Entered Installation failed page.
31/01/2013 19:31:45, INFO : Opening logs folder: C:\Documents and Settings\All Users\Application Data\Sophos\Management Installer

Can anyone suggest away to resolve this?

Thanks

Phil