Watch out - something new trying to attack computers! :(
Information ref:
http://www.mylot.com/w/discussions/2452565.aspx
My experience:
While browsing with FireFox my Dad called me and said he'd got viruses pop up, but when I looked it puzzled me - why this window was in an Internet tab?
It looked for all the world just like the 'My Computer' window on his machine with all the hard drives displayed - Systems Folders - Security Window, and on all of these icon's red flashing writing stating the number of viruses detected on each icon.
In the 'Security' section at the bottom of the page is a small window listing the names of the infections and the threat level - it does a good job of looking like the official Windows security, except that this also has a bar that loads from left to right as you watch that when its reached 100% says you are infected.
This thing baffled me until I googled it and came across information in the link above - though the address was slightly different I think it's the same thing.
Please, everyone be careful at first glance it's very convincing.