I was on the internet and then all of a sudden I got this blast of viruses and worms that according to Alpha Antivirus, have attacked my laptop. A pop-up from Alpha Antivirus keeps telling me that my computer has been attacked and that I should register with them to remove all the viruses. I clicked on "Remove" but it opens up a page where I have to purchase something using my credit card. I don't trust this. WHAT SHOULD I DO?