You didn't mention freezing / restarting in your previous posts so I never took it into account, you started with bios then went to sound, lol
Have you done all the usual virus / malware / spyware scans?
Have you run Memtest86+ ?
It may be the board, have you checked it for leaking/bulging caps?
Basically you're saying that the pc isn't stable, yes? Trouble shoot from the beginning, reset it to stock if it is overclocked and test your components.
What are your temps like? Have you checked your fans etc for dust buildup?