Protect yourself from the Conficker computer worm
http://www.microsoft.com/protect/computer/viruses/worms/conficker.mspx
Patch your system:
Microsoft Security Bulletin MS08-067 – Critical
http://www.microsoft.com/technet/security/Bulletin/MS08-067.mspx
Prevention.
http://www.microsoft.com/security/portal/Entry.aspx?Name=Worm:Win32/Conficker.D
7 Things You Need to Know About Conficker and links to removal tools.
http://www.extremetech.com/article2/0,2845,2344094,00.asp?kc=ETRSS02129TX1K0000532
Microsoft® Windows® Malicious Software Removal Tool (KB890830)