First time i was working on a song in reason, second time i was just checking out azureus. this black-grey box pops up and says 'You need to restart your computer. Please turn it off or hold down the power key', or some shit like that, and it's written in different languages below. The whole computer including the mouse doesn't respond at all, and the music i had playing from itunes started skipping on the same half-second. what does this mean?