the RAM isssue is due to 32 bit windows.
plz clean install a 64 OS...
and in the games disable Vsync....
i am using 64bit and my pc spec is gtx555 / i7-2600 @4.40GHz
and i did that already i used pc cleaner and i used avg 2013 and i used disk cleanup i cleaned everything in my computer but i believe i have a file in a computer that needs to be deleted but i dont know how il find it since theres like millions of files in a pc and i dont even know how it got there when i havet downloaded everything a week