1 in 3 Windows PCs vulnerable to worm attack

The worm that has infected several million Windows PCs is causing havoc because nearly a third of all systems remain unpatched 80 days after Microsoft Corp. rolled out an emergency fix, a security expert said today.

Based on scans of several hundred thousand customer-owned Windows PCs, Qualys Inc. concluded that about 30% of the machines have not yet been patched with the "out of cycle" fix Microsoft provided Oct. 23 as security update MS08-067.

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