As fresh as the New Year is the new round of Patch Tuesday releases for the year. For January, Microsoft released the following two (2) security bulletins:

Critical Bulletin

• MS08-001
  Vulnerability in Windows TCP/IP Could Allow Remote Code Execution (941644)

Important Bulletin

• MS08-002
  Vulnerability in LSASS Could Allow Local Elevation of Privilege (943485)

Windows users are advised to keep their systems up-to-date by applying the necessary patches supplied by Microsoft. You may refer here for the Windows Update Center.