I have a Windows Vista Home Premium 64-bit edition machine that has run reliably for the last year that I've had it. I typically leave it running 24 hours a day for one reason or another and have never had this problem before. What I am finding now is that it is frozen when I wake up in the morning or after I come home from work at the end of the day. The only changes that I can pin down are that I recently added a WD 2 terabyte internal drive, and also networked in a Mac OSX Leopard machine to help me with encoding processes I do for work. The freezing never happens when encoding, just when idle. Has anyone run into this issue and can help me out? I run AVG Internet Security with daily updates and scans, with nothing being found.