Last night, while I was playing Warhammer, my PC locked up. Not a complete lock; I could still move my mouse, but that's all I could do. Everything else was completely frozen. So I shut down, and when I tried to start it back up, when it tried to boot from my hdd, it gave me a "File disk read error, press ctrl+alt+del to restart" continually. I uneventfully tried a couple of the HDD diagnostic tools from the Ultimate Boot CD, but it seemingly had no effect. But the next time I restarted it, it booted fine.
So I go and check who got booted from my TS server, and jumped in to play some TF2 with them a bit. That played fine for a few hours. No lockups, no crashes, everything peachy. When we were all done with that, I decided to load of Adobe Illustrator for some late night drawing. I get ready to drag over set of new colors into my swatch, and bam! It locks up again. Able to move my mouse, but completely locked. I shut down, restarted, and it booted up fine with no errors this time.
So I just let my system run idling overnight. I woke up this morning to see that my system locked up yet again, at 7:10am (when it was really 9:45am). Mouse able to move, but that's it. Shut down, restarted, booted back up fine.
Now my question is I'm not exactly sure WTF is causing this. At first, I suspected my hard drive, after that initial "File disk read error", but I'm not entirely sure now. My system wasn't overheating either. Why was it fine with TF2, but lock up in Illustrator? Could it be memory? That would be a very viable suspect. I bought 2 1gb sticks of ram last week. 1 of them turned ended up dying after being in my system for 10 hours. Yes they are both the correct speeds, correct voltage, supported by the mobo, etc. If anyone has any ideas of what this could be... brainstorm away.