Help me! My keyboard is acting up?

I just turned on my computer today and tried to type in my pword. When I made a typo I hit the delete on. Instead, it spaces! And there were certain keys that I couldn't press unless I tried a few times. I managed to log in and open Firefox, then I was going to play a browser game. So I typed it in the search engine and the keys I pressed opened random programs. And no, the Windows key was not stuck, I opened the keyboard and cleaned it out and it still is not working!