From Bleeping Computer (http://www.bleepingcomputer.com/forums/topic303968.html):
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A devastating update by BitDefender was released on Saturday for their anti-virus engine that has caused crippling problems for users of x64, or 64-bit, versions of Windows. This update has caused BitDefender to flag Windows system files and BitDefender files as the Trojan.Fakealert.5 infection. Depending on a users action settings for when a virus is found, this has led to numerous Windows system files being added to the BitDefender quarantine. When this happens, these computers are not be able to boot into Windows.
See the full story at the above link.
Funny you mention this I was on Yahoo answers yesterday and a post came over with the BitDefender Trojan complaint, thinking it was just another trojan had the user run a Malwarebytes scan to check. In less than an hour about 10 to 15 more posts came with the same trojan complaint.. All 64-Bit and BitDefender Anti Virus..... Good thing it was confined to only 64 Bit systems..
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