Thats the newest one according to filehippo website, id just leave it at that mate, theres people i know still running 7.5 because they like it still and the reason im still on the version i said above is because i know my emotes dont work on the newer beta version.

Glad you got on but answers on a postcard as to what exactly the problem was but looking at your screenshots id say you were right and it was probably a software issue

Also i know it doesnt matter anymore but if you want to get rid off all traces of something the only way is using add/remove and then going into c:drive yourself and looking to see if the messenger is still there or not and then manually delete it, then use a registry cleaner like ccleaner(which you can get off that site you got messenger from)