alphadogg writes "Users of the BitDefender antivirus software started flooding the company's support forums Saturday, apparently after a faulty antivirus update caused 64-bit Windows machines to stop working. The company acknowledged the issue in a note explaining the problem. 'Due to a recent update it is possible that BitDefender detects several Windows and BitDefender files as infected with Trojan.FakeAlert.5,' the company said. The acknowledgment came after BitDefender users had logged hundreds of posts on the topic. Some complained of being unable to reboot their systems."