I think there is registry problem try to repair your registry or try to shut down your computer from the taskmanager or creat a short on the desktop or try to shut down it from cmd.Try this all methods.
I also use my laptop as a desktop because i think it feel good to watch a movie or somethintg else in a big screen. I use it as a desktop at home but not outside.
Every desktop with 7 have this problem, so nothing to do with it just download team viewer and i think it habe more features than the default 7 remote desktop.