[mrgeeky]

Reinstalling is for when you have a serious issue that cannot be resolved. Your issue can. There are quite a few issues that could be causing you problem. use the error from event viewer and google the issue you will see many people have had this issue and many people have reformatted or reinstalled only to have the same problem when they reinstall. What a waste of time.
One such cause for this issue maybe, go through all your installed programs and check the help menu on anything your not sure of to see if it was originally created for win 98, 2000 etc, and not for XP. If this is the case you may have compatiblity issues.
If so, go to start, all programs, etc. Right click on each program and check properties. Check click on compatibility, compatibilty mode (from memory) and choose either win2000, win 98 or Win 95 if thats what the program was originally created for. Any one will do.
Then click on disable visual themes ( I think it is).
I have used this to resolve a similar issue.

You could also use MSconfig to selectivly disable etc etc, till you find out the cause.
Lots of reasons, lots of diff fixes, reinstalling isnt the answer.
good luck.