Marlicia Marz Pollard

I have an 08 lexus IS350 and my touch function has stopped working on my screen. Only time the screen has somewhat of a response is when I'm on the navigation screen and I touch it and it keeps going to the right. I have navigation with bluetooth and rear backup camera and everything integrated. Anyone have a clue what I need to do or DCFish do you possibly have a replacement screen? My email is marfel915@gmail.com Thanks in Advance