This seems to be infecting a lot of people lately. I had the same thing happen to me over the weekend. If you follow the instructions on the website below, it will remove the malware. There is a link to a spyware/malware program that will remove it from your computer.
How to remove AV Security Suite (Uninstall Guide)
Its a terrible virus! You can get infected just from visiting a website! They are able to insert it into ads on sites.
The site above also suggests keeping software and Windows updates current. I don't have my laptop on all the time, so I think I sometimes skip the automatic updates.