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I can think only of 2 things there:
1. Reboot your PC and see if anything is ok again
2. Could be that your graphics-card is old and broken down - same thing happened to my previous card, there was image, but not seeable one and WindXP didn't start anymore (stopped at loading).
If the first step doesn't help, start Windows in that troubleshooting-mode (don't recall the real name now) and see if the screen is ok there. If it is, there's some configuration problem with the card in Windows OR a kind of virus from the site that isn't any - a program that just messes the PC up and isn't a virus.