Error in Upgrade Wizard after installing

This error occurred when checking for update again after installing

Log Name: Application
Source: Application Error
Date: 29/04/2009 11:09:38
Event ID: 1000
Task Category: (100)
Level: Error
Keywords: Classic
User: N/A
Computer: BlahBlah
Faulting application UpgradeWizard.exe, version, time stamp 0x49f6b3b7, faulting module UpgradeWizard.exe, version, time stamp 0x49f6b3b7, exception code 0xc0000005, fault offset 0x0004cfd5, process id 0xea0, application start time 0x01c9c8b2994a2afa.

Vista Home Premium 32 Bit

Hi Peroulades

Do you still have a problem with upgrade wizard?

Would you, please inform us about installed firewall/antivirus?

Thanks in advance,

I have since uninstalled and reinstalled (twice, once on Administrator Account and once on Limited User Account) and after both occasions it has worked correctly.

I tried it twice because the original install where the problem occurred was done on a Limited User Account and I thought the problem may have been associated with that.

CIS 3.9.74913.496 with AV, Threatfire, Windows Defender, Spybot TeaTimer, WinPatrol (all latest versions)