(April Fools) Conficker worm virus (also known as Downandup).
Here's what to do:
1. Make sure all Windows updates are installed. Go to http://windowsupdate.microsoft.com
2. Download and run the Microsoft Malicious Software Removal Tool
found here (click skip the details and download the took):
http://www.microsoft.com/security/malwareremove
3. Make sure your AntiVirus software is updated. If necessary, if it
is old and outdated, remove it using add/remove programs, then install
AVG Free AntiVirus software found listed among the top ten programs
found here: http://www.download.com
That's it!
