every time i start my computer it runs ,even after i press x to exit it starts again , i got windows to run by pressing f8 and booted from hdd ,i have run bcdedit /bootsequence {memdiag} /remove in command prompt and it said it worked ,on retarting computer the memory diagnostic runs again ????? ,memory has passed test , anyone know what is going on , i also have 2 x 4gb usb drives running readyboost ,could this be causing this??