i know it sound stupid but lindz thingy sound like a heating problemes. why would it crash with some game and not with some other? becuz some game are way more demending on your cpu,wich create more heat. have u clean your pc in the last....year?especially in u own a cat,if theres lots of dust behind your pc desk,etc.etc i just built my son a pc with some old parts that i got here,it took me more time to clean the cloaged fan on my video card then to built the entire pc! And opti,i would take the time to save my data and go ahead with a reformat,,,think about it,a clean system! and no its not as long as it sound,it can be done withing a hour.just get all your drivers ready before u do it. i can help u with that if needed.