The only thing that I have open is a web browser. the freezing doesn't happen during a game. It usually occurs when i come back to my pc after a bit. i'm not sure if this is a hard drive issue. i just built this pc. i have an asus sabretooth x58 1366, i7-950, corsair dominator 6gb 1600, and an sapphire hd 5850. the hard drive is seagate 1tb.
Yeah. Everytime I leave and come back, the monitor would be asleep. I would move the mouse to wake it up. I'd see my own browser open. That's hardly anything, but it would be frozen at that time. It only ever happens at that time. I can play FFXIV or WoW for hours at a time without an issue.
Check your MB drivers and then check the BIOS updates for any mention of the issue.
Also try changing your power saving options in Windows. Just change and save... certainly extending the time before the screensaver or HDD shutdown occurs won't hurt, and it may help you isolate the issue.
Speaking of which, check your Win 7 error log for hints to the issue.