Here is a document with touch screen troubleshooting steps that may be of some help.

If you continue to have problems, think back to just prior to the touch screen failing were any applications, utilities or external devices attached to the system? It is possible they could be causing a problem with the touch screen.

There isn't any drivers that I am aware of that is needed for the touch screen to operate correctly so if the problem continues you may want to consider a service on repairing the LCD panel.  Please let me know what you find out.

TB