I had this problem a while back and it seemed to resolve itself when I installed SP2. I had to reinstall XP again and - hooray - this problem is back It seems to happen sporadically; selecting a user on the XP login screen, clicking a link in Firefox, opening a Word doc - I can't see a pattern. I've run chkdsk, memtest, cleaned my ram contacts as per the guide and no luck. Attached is my minidump; any ideas what could be the root of my problem? I installed all xp patches, drivers etc, all software is current (filehippo.com) and my video and audio drivers are correct and current using the sis.com model scanner and download facility. I'm really stumped on this and it's annoying the hell out of me. Any help would be greatly appreciated!