> I didn't do a clean install and would rather not. It's an X2 4200+. Abit KN8.
> 7800GT. Civ4 Warlords crashes constantly. NFSU2 crashed constantly. Star Wars
> KOTOR crashed once and stalled once so far. Planescape Torment was having weird
> issues such as stalling that I don't recall having when the system was single
> core. Oblivion runs fine, but it's multi-threaded. Seems like anything that
> isn't gets limited to one core, so really my old 3200+ single core would be more
> effective in those instances. Everything other than games though run fine.
> e; Some more KOTOR crashes, and also a BSOD that referenced "HCF_MSFT".
I'm wondering if you have a big enough power supply.
Lack of power will produce symptoms similar to those you are experiencing and then run fine when not doing graphics intensive tasks. No 20pin to 24pin adapters and plenty of 12v. See if you can beg or borrow another PS to try.
You are correct about most games only using one core, but this is changing supposedly as the single cores are becoming rare on all but entry level boxes.
HCF_MSFT.sys is a Windows built-in driver for a Conexant softmodem, I have heard of rumors of it, but not seem it used to conceal malware, to be safe give it a check over.