App crash c0000005 in some things but not others

So i recently built my own computer, i then installed windows and everything was jolly (it seemed) then after updating windows i would get the c0000005 all the time, i had imaged my OS install to just after installing all my chipset drivers using acronis true image and after running 2 12 hour memtest on my memory sticks i thought ill just revert to the image, i have a feeling it didn't work right, as i still get the errors, but not its just random, some games / apps can run for eternity, some crash instantly (mostly older games, a old pre dx9 game c0000005 crashes, mechcommander gets failed to create primary display surface), it also removed all my updates and i don't really want to use windows update, so ive loaded up a copy of windows 7 with all of the windows updates for windows 7 (including sp1) and was wondering if i this just sounds like some kind of installation degradation and if i should just format?

PS All of these games that now get this error i was able to play a week ago

Corrupt files found but it was unable to fix them, i don't mind formatting i'm only a bit into this windows install, should i just format?

Alright well i was just wondering if it might of been a memory error but i ran memtest for 24+ hours, and did a 12 hours long blend test with prime95 and some games just never crash, but im not expert so.

Alright thanks.