A privilege escalation vulnerability in the Windows kernel can be exploited to bypass Microsoft's UAC (user account control) security mechanism
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8 out of 10 malware samples tested on Windows 7 with default UAC (user access control) settings don't trigger a warning.
The User Account Control feature in Windows Vista has been known to drive normally level-headed people over the edge with frustration. If you find it annoying, you might be tempted to turn it off. According to Microsoft research, somewhere between 12 and 16 percent of all Windows Vista users do exactly that. But before you take such a radical step, it helps to understand what UAC is actually doing on your behalf and how you can tone down its hard edges without sacrificing its protection. The three techniques I outline here (with illustrations in the accompanying screenshot gallery) can help cut the annoyance factor dramatically.