Vulnerability in Microsoft DirectShow Could Allow Remote Code Execution MS10-013 - Critical

The vulnerability could allow remote code execution if a user opened a specially crafted AVI file. An attacker who successfully exploited this vulnerability could take complete control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.

More Info:
http://www.microsoft.com/technet/security/Bulletin/Ms10-013.mspx

Security Update for Windows Server 2008 R2 x64 Edition (KB975560)
Start download