I've never been able to get the driver from xenarc to work (I just haven't played around much with it). Here is a link to the evtouch drivers which I use with my xenarc touchscreen:
Touchscreen and other downloads
This script should actually download and install everything for you including the udev rules. All you should have to do is run the calibrator.
There is also a howto that should help you get up and running. Good luck!