I am experiencing this same problem it took up about 30 gigs before I could find where it was coming from. I can delete the .tmp files but as soon as I delete them four more will come, and they keep coming, usually in groups of four. Ok, I just let it sit for 5 minutes and 404 were there, after I cleaned it. In the time it took me to delete them 8 more had been made. They alternate in file size between 2,225 kb and 9 kb, every other one. I also use Zone Alarm, but I realized they only fill up like this when ZA isn't running. And I can't seem to open ZA during this problem. Norton Antivirus found no problems in the WINDOWS folder. Any other suggestions?