I missed the Untangle part, sorry.

It's possible that Untangle does not contain drivers, utilities etc. for USB. If you can't get an answer to the problem from Untangle's forums, we probably can't help much here.

Without getting into the technical issues here, it might be worthwhile for you to consider downloading a livecd linux distro (Knoppix itself of course, but there a others).

A couple of links:

http://distrowatch.com/

http://packages.debian.org/unstable/utils/usbutils

Regards...