Hello and thanks for the response. I sheepishly realised when you said that you couldn't locate the device, that I had made a mistake in the model number. It is a Targus ACP7703AUZ. The link to it is:
http://www.targus.com/au/targus-usb3...ion-with-power.
I have run the support tool on the Windows 7 Enterprise machine. The log is attached.
I don't have a USB2 A - B cable to test that aspect. The 2 monitors are Lenovo Thinkvision T24i-10. I have tried connecting them with both the DVI and displayport connections with no difference experienced.
Thanks
Tony.