Barry;
Why are you attempting to load a USB driver in the first place? That's pretty basic stuff and should already be pre-installed as part of the Windows software. Since you aren't using a USB to Serial cable, there is no USB driver software required for a TIU other than the basic Windows USB driver.
I think you're mistaken about the only requirement being "the basic Windows USB driver".
I have a plain vanilla install of Windows Home Premium Ver. 7 with SP 1 64bit and all my USB devices work without any additional driver installs!
I'd like to know if anyone with a plain windows install (without any such gadgets such as a USB to serial cable) has been able to use the TIU with a USB cable WITHOUT any additional driver installs.
I suspect the folks who have used a rev. L TIU with a USB cable without any additional driver installs have done so because they already had a suitable driver in their windows system AND it didn't come from Microsoft!
I suspect these folks are the same ones who have used things such as the USB to serial cables FIRST, and then have gone on to use a rev L TIU with a USB cable!
FWIW -- Ray