I've never seen this with USB. USB is keyed to the
device's description -- not to a specific port.

Wrong.

If I plug my iRiver H120 into any USB port on any computer, it's supposed to
recognize that the device is a hard drive, and install the appropriate
generic driver to communicate with it.

If the device isn't "generic", the system will look through its "records"
for the correct driver. If it finds it, fine. If not, it prompts me for the
appropriate driver.

I assume what Michael says about Epson screwing everything up is true. I've
never installed an Epson product.