There is a new virus going around called Security Tool 2011. The virus seems to be transmitted by victims clicking on links to websites in emails or web pages. These websites are infected in such a way, that the virus is downloaded in the background, without you knowing. After you are infected, messages pop up suggesting that you have many infections in your system, and that you need to purchase the full suite to remove them. This is a classic fake-alert, designed to get your credit card details.
If you think you have been infected, contact us here, and we will arrange to fix your computer.