It seems I've been getting more and more crashes recently. It's always just a cold crash out of nowhere, like I pushed alt-F4. No error dialog or anything, the window just vanishes like it was never there. I've got no logs in the dir. I've tried upgrading to latest vid drivers and it's made no difference. My computer otherwise is rock solid stable, able to run Prime 95 for at least 10 hours (haven't gone longer).

Hello Puzzl

Can you try rolling your video card drivers back to these:
http://www.nvidia.com/object/winxp_196.21_whql.html