Yeah. The owners/website staff do their best, but using IE I caught the same virus as Joe did. After formatting, I switched to using the Opera browser. That stopped all problems!
The notice you have is either the virus itself (worst case scenario) or a normal warning from Google Chrome.
First, go into "processes" in Task Manager, and see if there's something like "av.exe" or "av2011.exe" or something. If it's there, back up the stuff which is NEEDED, and format your computer. System restore didn't work for me, had to be a full format. Then get the Opera browser.
If it isn't there, go straight into downloading Opera!
Hope this helps.
P.S. If you have got the "av.exe" or "av2011.exe", don't just try to end the process, it doesn't work. Just wipe your computer.