Zidane flying to Munich for Real Madrid Ribery talks

My laptop has been A LOT slower than usual, and a lot of the pages on the internet don't respond. I'm thinking it's a virus, and i would like to know what you think it could be, and what i could do to prevent further viruses, and "cure" this one? anything can help :) thank you. Oh, and when it doesn't respond, the screen goes like white, but you can still see through it, and it makes this low beep noise?