Windows live messenger won't work properly

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Hello,
i have just cleaned my computer from a virus and now i cannot do things on windows live messenger why? I used to have the latest version on windows live messenger before and it used to work perfectly. But after I cleared out my computer and installed the latest version of it...I haven't been able to change my display picture...I have that little icon picture...also I cannot change my background..or send emotions or download any emotions or anything....also it says that: The file you have selected is not a valid image file. Please choose another file.
Please help me...because I love using messenger!!!