I had this blue screen before. As well as my computer freezing. I tried everything to stop it freezing but nothing worked. so I reinstalled windows 7 but didn't format the hard drive. This was nearly 2 weeks ago. After reinstalling it it worked fine. until a couple of days ago I reinstalled the new ram and earlier today I got the blue screen. It was the same blue screen as I got before reinstalling windows. It says DRIVER_VERIFIER_DETECTED_VIOLATION. It was caused by the driver ntoskrnl.exe. I don't know much about this driver or anything so I don't know what to do about it. Any help is appreciated. thanks.