Unfortunately there's millions of variants of these kind of Messenger viruses. Although
generally they're all just a rogue process running when you can find in Task Manager, locate
it's file, terminate and then delete yourself.
If you can't find it, you might want to try some anti-virus tools, like the OneCare scan:
Microsoft MVP - Windows Live Messenger/MSN Messenger/Windows Messenger
Messenger Resources - http://www.yqcomputer.com/
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