Well, I think I fixed it, but still don't know for sure what it was. I thought it was the video card for awhile, but I tried another AGP card and a PCI card when it kept freezing to make sure. I then tried the suggested blow drier on specific parts of the computer to check for overheating, and that didn't cause any freezing either. When I used the box as a drum set, it seem to freeze when I got up to a specific bpm , so I assumed something was loose. I reconnected pretty much every cable in there, and no freezes for a day. Thanks for the help guys.