Hi True. Sorry to hear that all the solutions have led to a dead end. Have you tried running sfc to check the system files? Unfortunately you don't have your XP cd and sometimes it asks for it. Do you know anyone else who has an XP cd? Have you tried re-registering these DLLs?

regsvr32 wuapi.dll
regsvr32 wups.dll
regsvr32 wuaueng.dll
regsvr32 wucltui.dll
regsvr32 msxml3.dll

I would just create a batch file and stick those lines in like they are in this reply and run the batch file. After that, try reinstalling the VB Script. If that doesn't work, the only other 2 options I can think of is an OS repair or a complete reinstall (both of which will require you to have an XP CD).