There's a nasty bug going around called Antivirus 2009 that masquerades as an antivirus program. It pops up a realistic looking screen on your computer showing bad programs it claims to have found and then prompts you to buy a program to remove them. Not only don't you get an antivirus program for your money, you probably get a load of additional malware. Antivirus 2009 may attempt to change your computer's desktop, hijack your browser, monitor your Internet browsing activities, change system files, and can do this without your knowledge or permission. The Web has a number of places that claim to have ways to get rid of Antivirus 2009. I can't vouch for any of these working. If anyone has had to deal with Anitivirus 2009, a comment posted here would be appreciated.