After running Windows XP for a couple weeks in Virtual Machine perfectly at one day the frame froze. The only I could do was to restart and after this VM window is a black screen only. I tried with Fn F8 to start in Safe Mode (so I can remove Tools) but it wont start up in Safe Mode because after confirming the screen turns to black again. I tried to reinstall Parallel desktop and Windows XP, but the problem remains. What to do?