Make sure your system is up to date and has the latest protections in place.

1. AVG anti-virus: 12/21/08
2. Avast: 12/19/08
3. Norton anti-virus: 12/17/08
4. McAfee anti-virus: 12/17/08
5. Lavasoft Ad-Aware: 12/17/08
6. Spybot Search and Destroy: 12/19/08
7. Microsoft Windows Defender: 12/17/08
8. Nod32: 12/20/08

Updates as of December 21.  2008 6:00am CDT.