Microsoft released only one security bulletin this month, and it contains only one vulnerability. Also, this vulnerability is only listed as critical for the Window 2000 operating system.
The security update for this vulnerability is available for download at the Microsoft Update web site (https://update.microsoft.com/microsoftupdate/). Please note that systems joined to the LSU Active Directory automatically receive the critical update when available. Other updates will have to be installed from Microsoft Update.
Remember to close all applications at the end of work day today, as security updates may require a restart of your machine.
Additional Information / Tools:
Microsoft Security Bulletin - http://www.microsoft.com/technet/security/bulletin/ms10-jan.mspx
US-CERT Technical Alerts - http://www.us-cert.gov/cas/techalerts/
Microsoft Baseline Security Analyzer - http://www.microsoft.com/technet/security/tools/mbsa2_1/default.mspx