HELP! Lately I have been experiencing some problems with my Windows 7 copy. It is sometimes having problems on startup. I see the whole screen, but it is as if the system is just not responding. When I then manually shut down the computer, enter password and so on I get a black screen (it does say Evaluation Copy in bottom corner though) I have also experienced that during an syncronisation of my iPhone the computer suddenly just shut down - just like that. No warnings or anything, and when I then tried to turn it on again the errors mentioned above happened.. Any suggestions?