my touchscreen is finiky sometimes as well, It got MUCH better after I put it on a powered usb hub up front and not just on a extension cable to the back of my car. How long is the cable you are running?
I still have driver related shut down issues with it though. Keeps throwing svchost errors. I am convinced they are related to the touchscreen.
it's connected to a powered hub....and I'm using a USB extension since I have no choice...
I'll try those drivers and see if it helps any...but I won't know for sure for a few days since I don't drive the car every day....ride bikes instead...lol