sx2210t Touch is not responding

I have an E6400 in its docking station.

Running Windows 7 Enterprise.

Have installed the:

    drivers (R228572)

    The TST (R238339)

    The Touch cam software (R228609)

In that order as Admin.

Using the Touch Screen Tools

    Running Diagnostics get a "Pass"

    Calibration works (or appears to as the arrow moves to each location after touching the screen for a few seconds)

Still the touch does not work.

In Device Manager under :

    Human Interface Devices: there is a NextWindow 1950 TouchScreen installed and "working properly" I have unistalled this and then reinstalled the above drivers.

    Monitors: it shows two monitors; "Generic PnP Monitor" and an "Dell SX2210T(Digital)"

I have set the SX2210T to be the primary screen.

Plugging and unplugging the USB cable connects and disconnects a "Multitouch Device 002709"

I have plugged the USB into all of the docking station and laptops ports.

Does anyone have any ideas about what I need to check next.