I have a sony vaio VGN nw350f that keeps freezing while playing online videos and games. When it freezes the sound will keep playing but at a slower, louder, more annoying speed. Sometimes when I restart or turn on the laptop after shutting it off it will tell me "Operating system not found" or just blink _ at me. Don't know if these symptoms are related. I tried downloading both intel and sony display drivers where at first I was able to install, now when I try to install any of the drivers it says I don't have the right drivers for the right OS. OS: windows 7 x64 edit: I have already restored the HDD to factory default.