I only brought up Rundll as an after thought consideration, as far as I can tell the driver works fine, the usb ports just don't recognize the device anymore for some unknown reason.
The Device and driver are Zyxel by the way and I have downloaded the latest version (amidst the confussion of choices on their website) and it does nothing. Ideally I would like to have a generic driver and not use the one tailor made for my wireless device as its been nothing but trouble, but I doubt that's at the root of this dillemma.
Since that computer doesn't have internet, doing online diagnostics or checking for updates or anything else online is also pretty much out of the question.
Hopefully more light can be shed on the matter as this thread ages.