My Apple Wireless keyboard is adding letters to things I type

There are a few keys that are affected. I litterally can not type. Here is an example of me writing "Hello, can you please fix my keyboard? I want to be able to type to others."

Hewllo, cxan you plewasew fsix my kewyboarwds? I want to bew ablew to typew to othewrws.

Please help! What is wrong??? I have to check and delete after every letter.

"I havxew to cxhewcxk ands dsewlewtew afstewrw ewvxewrwy lewettewrw." ^

Running Mac OSX 10.7

iMac 27" Mid 2011 2.7 GHz