I just thanked DAVE, but this is kind of a noob question so I'll answer it and cut you the trouble.
But please, as DAVE SAID, a little reading will do everyone good
Go to the Attachments of this thread and download a cab called " Sprint keyboard fix"
That should fix it.
And yes, 4 pages back, Dave wrote a pretty nice summary on how to increase performance to your roms and how to ask less questions on those who have been answered a kaziollion times.