Random Windows7 freezes. Have to hard reset and reboot. If a program is running with sound it will sound loop. Tried the hot fix from microsoft, updated all drivers, virus scan. This was my first self built system (about 2 months ago). Read alot about ram voltages causing freezes but I am unsure on what to set mine to.
Reset the CMOS memory the right way as is described in the motherboard manual using the clear CMOS link with the power cord unplugged.
And when the battery is out, press the power button to discharge all the electricity from the system. How To Clear CMOS @ http://pcsupport.about.com/od/fixtheproblem/tp/clearcmo...
I believe it was happening before I upgraded my nvidia drivers. I suppose I could roll em back and see, but still havent had a freeze up since last night. So hard to say if it is fixed or not if i do make attempts to correct. Sometimes ill get 1 a day sometimes 3 in a night. Seems no rhyme or reason.
For the memory best use either BIOS default setting, or load an XMP Profile in the BIOS. And like Nikorr mentioned, it could be anything incl PSU. If you have another decent PSU or if you can borrow one, it is worth trying.