I did a system restore that undid a month's worth of Windows updates, and my computer was working fine until about an hour later when I decided to run Windows Update again. I mean, since I had undone a month's worth and another month had passed since I last used the computer. It crashed while installing and now it's behaving exactly as it did before. Could it be one of the updates? It's possible it's just a coincidence, but I BSOD'd a whole classroom of computers once because after updating Windows suddenly decided it didn't like the drivers used for the printer or something weird like that. It made for a nice photo.