XP Pro always recovers from "serious error"

I have xp pro (only recently installed), every time I boot up now I get the "this machine has recovered from a serious error" dialog. Viewing the details tells me that the suspect file is "C:\documents~\myname\locals~\temp\wer.tmp.dir00\sysdata.xml".
Every now and then the "wer" will change to "wer01" or "02".
If I go into the temp folder to find the suspect file, it wont be there, I can only find it if the file has changed names from wer to wer01 or wer02 as it does from time to time.

I've opened up a wer01 file and found many references to drivers and the like.

P.s I may have the tildes in the wrong place in the file location above.
I can usually work these sorts of problems out but this one really has me stumped.
Any ideas.