The Yahoo messenger and MSN Messenger worm (Palevo) which is spreading through instant messages can be removed easily.
To remove the worm
1. Stop the process "infocard.exe." using task manager
2. Delete the following files in the Windows folder
mds.sys
mdt.sys
winbrd.jpg
infocard.exe
These two steps should clean your Computer.
Tip: Never click on suspicious links.
[Via Tech Blog]