Various websites have reported that Windows 7 has an ‘unfixable’ exploit and that two researchers have found it. They claimed that they can access to any Windows 7 computer undetected by using a program called VBootkit 2.0 which is 3 kb in size.
It gives the hacker the ability to do anything he or she wants on an exploited computer.
Virus scanners will struggle to detect it according to the article at Gizmondo. The article also notes that the program can’t be installed remotely.
Source: Gizmondo

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Lee
Thank you for putting unfixable in quotes, the other sites I read this on were making it sound like it was a real threat. If someone who would put this on your machine has physical access to it in the first place, I’d be far more worried about having the machine stolen than getting a virus put on it.
I have yet to see a problem that was “unfixable”. That being said if someone already has access to your machine they pretty much have access to all of your data anyway. Keyloggers, USB/SATA/IDE adapter, you name it. Just encrypt all of your personal data and put in on a flash drive and you should be fine. lol