So i did a fresh install of Windows 7 RC a few months back, and it worked like a charm all of the time. Recently i got windows 7 Ultimate and did another fresh install onto my system. It ran like a champ for a few day but now it wont run for more that a few hours without freezing up or crashing. If a bittorrent client is running, it will BSOD, or if left idle for a period of time, it will be unresponsive upon return forcing you to restart it. i dont know what to do. SO FRUSTRATED
Sounds like hardware issues, you will need to physically take out the hardware(e.g. sound cards, tv tuner, etc.) just start system with only the bare motherboard, video, ram and hard drive.
Make sure you have the latest drivers, but not beta drivers.
Microsoft does have an official Windows 7 Support Forum located here http://tinyurl.com/9fhdl5 . It is supported by product specialists as well as engineers and support teams. You may want to check the threads available there for additional assitance and support.