This happend since using version 7 of MSNM.
Did you uninstall including preferences? If not the preferences are kept in the registry. There can be several folders remaining for Plus! e.g Messenger Plus2..just delete all folders containing Messenger Plus! from program files folder after you uninstalled and rebooted.
Lil tip: use the "edit" button at the bottom of your post if you wanna add something before somebody else posted. Double posting is against
forum rules 
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