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SANS Top 20 Vulnerabilities - The Experts Consensus

The SANS Top-20 is a living document. It includes step-by-step instructions and pointers to additional information useful for correcting the security flaws. We will update the list and the instructions as more critical threats and more current or convenient methods of protection are identified, and we welcome your input along the way. This is a community consensus document -- your experience in fighting attackers and in eliminating the vulnerabilities can help others who come after you.
This should have been done long back.... anyway, I think this is a good step towards protecting one's PCs.