99% of PCs worldwide are vulnerable to latest Windows flaw

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Latest outbreak may be worst in computing history. Official Microsoft fix not available for at least a week

The latest Windows security hole has left most of the world's computers vulnerable to attack. Unlike most previous security flaws, this one is being actively exploited by Spyaxe and over 100 other malware programs.

The latest flaw in the Windows Meta File (WMF) means ordinary computer users can be infected with virus and spyware programs simply by viewing an image on an infected webpage.

Internet users are advised to download the latest antivirus and anti-spyware updates immediately, as an official patch from Microsoft will not be available until at least January 10th.

Chief Research Officer at F-Secure, Mikko Hypponen states: "Right now, the situation is bad but it could be much worse. The potential for problems is bigger than we have ever seen. We estimate 99 per cent of computers worldwide are vulnerable to this attack."