Microsoft Critical Security Release - MS08-067

http://www.microsoft.com/technet/security/bulletin/MS08-067.mspx

New Security Bulletin Technical Details

 

Identifier	MS08-067
Severity Rating	This security update is rated Critical for all supported editions of Microsoft Windows 2000, Windows XP, Windows Server 2003, and rated Important for all supported editions of Windows Vista and Windows Server 2008.
Impact of Vulnerability	Remote Code Execution
Detection	Microsoft Baseline Security Analyzer can detect whether your computer system requires this update.
Affected Software	All currently supported versions of Windows
Restart Requirement	The update requires a restart.
Removal Information	·         For Windows 2000, Windows XP, Windows Server 2003: Use Add or Remove Programs tool in Control Panel or the Spuninst.exe utility ·         For Windows Vista and Windows Server 2008: WUSA.exe does not support uninstall of updates. To uninstall an update installed by WUSA, click Control Panel, and then click Security. Under Windows Update, click View installed updates and select from the list of updates.
Bulletins Replaced by This Update	MS06-040 is superseded on these operating systems: Windows 2000 SP4, Windows XP SP2, Windows XP X64, Windows Server 2003 SP1, Windows Server 2003 X64, Windows Server 2003 SP1 for Itanium-based Systems.
Full Details:	http://www.microsoft.com/technet/security/bulletin/MS08-067.mspx

To summarize.. Go update if you haven't already.