I have a Compaq wireless keyboard and mouse,and the keyboard has been messing up lately. The space bar, enter, and backspace are working all the time, and sometimes some of the letters arent working. this keyboard is a few years old, if i had to guess, about 4. any ideas on how to fix it? and if it is just the age of the keyboard, what are some good keyboards out there that are wireless? for about $50.