Computer is messed NEED help please

so i was playing a game and i tapped Shift five times in a row, then it exited the game and said something about sticky keys. i didnt touch anything. i simply pressed cancel, then i was on msn, i wrote something and i couldnt send it,usually i press enter and it sends, but all it was doing was skipping lines. same thing happened when i pressed send. also, when im on ns, i go to click on a thread, and it comes up in a new window, it never used to, pretty much everything comes up in a new window. what happened and can someone please help me.