hi i am using windows vista home premium. after my screen froze i restarted windows.after boot option menu i get black screen for 5 min then it comes up with -file \windows\system32\winload.exe. error code 0xc000000f. and it asks to insert windows vista repair disk to fix the problem! ok .so i insert windows vista dvd! boot from dvd drive! same thing black screen with white arrow than i can move!but it wont let me do nothing its just a black screen! i tried to install windows 7. but again after boot menu which only gives me f2 and f12 to pres. i get black screen! nothing else! i cant axes boot in safe mode or last good configuration by pressing escape button the f1 button! can it be graphic card problems? i am using Toshiba satellite l300! thanks!