Firefox: a virus comes from a fake Windows Update

In the last few hours, a new virus is spreading through a fake Windows Update page, users are most at risk appear to be those that use the Firefox browser, which is presented with a Windows Update page that detects fake updates.

• How do I stop Windows updating automatically? (10/06/2011)
• Fake Anti-Virus Software Targets Firefox Users (14/06/2011)
• Fake antivirus software wears convincing Microsoft Update mask (09/06/2011)
• Driver Update Utilities (14/06/2011)
• IE9 bump brings security fixes, new 'About' box (15/06/2011)

Windows Update (wikipedia)