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I've been watching this story about the PatchGuard system in Vista for some time. It's an interesting one. Basically, the security companies have made their fortunes by patching up holes that Microsoft has neglected. It's an important function considering how many holes there have been (I count almost 70 critical security patches since Windows XP SP2). However the biggest worry is rootkit-like systems that compromise the kernel. Such systems can hide themselves even from virus checkers...