but sometimes it sticks and closes (but the box appears that the application does not work)
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Did I change the compatibility of the application?, in that case I will put it as windows vista.
If I download Messenger Plus and install it, will the application stop working?
no 
I could not put it, because if I activate the compatibility option as windows vista messenger does not start. but it works well for me, better leave it that way 
well luck on that fix
WLM 8.1 has been proven to be buggy