"Microsoft today released a pair of security updates to plug at least four security holes in its Windows operating systems and other software. The software patches are available through Windows Update or via Automatic Updates.
One of the patches earned Microsoft’s most dire "critical" rating, while the other carries the less severe "important" label. Microsoft assigns a critical rating to vulnerabilities that hackers can exploit to break into vulnerable systems without any help from the victim. Important updates address flaws that usually require the victim to help the exploit along in some key way. " – Content courtesy of Microsoft Patches Four Windows Security Holes – Security Fix