Vista - USB Scanner install (Cannot copy files)

I am attempting to install a Visioneer onetouch USB scanner on Vista
Ultimate. It recognizes the scanner and finds a driver on Windows Update. The
install fails.
I am well aware that I should wait for the vendor to release a Vista
driver......
My concern is that, when the driver install runs (even from Windows Update),
it fails saying that it cannot copy files. It then pops up a box saying that
Empire of Ages II is not compatible (I don't have this game on my computer.
In fact, I have not loaded any games yet). There are no other messages. The
event log also gives no additional info. I am running as administrator, with
UAC turned off. This is a clean install of Vista Ultimate. I diabled Anti
Virus software first. Visioneer has several utilities that are supposed clean
the registry, etc prior to trying a re-install. I have run these and get the
same message.

Jim