Messenger sending unauthorised messages from my account

Hi

Messenger keeps sending instant messages to people on my contact list saying they can either get something free or they have won. I have followed your 8 step guide for virus but it all came back clear.

What should I do?
 
ALL IM software is exposed to this problem. IM and P2P are difficult to control
(ie who sends what to whom). IMO, just uninstall.
 
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