According to ComputerWorld, curious Web surfers who visited the blog, Reallyvirtual.com, belonging to the guy that was tweeting about the Bin Laden takedown from on the ground as it happened, may have had fake-anti-virus malware quietly installed onto their computers. The blog was quickly hacked, and the site was attempting to install the malicious “Windows Recovery” program until about 9:30 a.m. Pacific Time Monday.
Windows Recovery hides system folders on the PC and then tries to scare the victim into paying for bogus software that it claims will fix the issue. If you visited this blog during that time period, best be running a real anti-virus scan on it, ASAP. Follow the removal advice provided in the link above.