Online Scan Free

On the bottom right dock of Windows XP there is a little red shield with an X in it, the same as the XP Security logo that is there. A text box pops out that says "You have a security problem." If you click on the box it takes you to a web site called pro-scan-online.com, saying it is doing a "Free Virus Scan". It NEVER goes away. Everything on the website is very shady. Has anyone else experienced this problem?

More Online Free Scanning Info:

• Weasel Zippers » Blog Archive » Logo For Obama's "Nuclear Security Summit" Looks Oddly Familiar…
• Best Anti Virus Scan ? Best Tools for Computer Virus Removal – Free Web Template Stock.com