Custom pc crash!!! memory could not be read for like every program

nonaddictedgamer

Distinguished
Dec 1, 2011
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Ok so I'm on my custom tower a hour ago that is two years old I guess now. All of a sudden I get a white screen behind firefox that says app crash windows explorer must close could not read memory, then I see many windows like that for every vital program including tea timer, win32, etc.. So I shut down and reboot. I get the same problem but without the white screen. Only I can't open firefox, ie, winrar, avg, and system settings. And even programs that will open I get many messages that say "the instruction at 0x74bc07a5 referenced memory at 0x74bdffff. the memory could not be read. click ok the terminate the program". It keeps popping up and my system is rendered useless in this state.

Specs
win 7 pro 64 bit
asus saber mobo
intel core i5 2500k stock
Corsair vengeance 2 2gb sticks 8-8-8-24 1.50v
Crucial Ballstix 2 4gb unsure on specs
evga gtx560 ti
adata 128 ssd
segate 1 tb spin drive


avg free 2015
spybot search and destroy for protection

What should I do? I would like to try to fix it before doing a clean install

Thanks