If this is XP then there are issues with USB 2.0. It was hell to sort out here. You had to load the USB stuff in a very specific order or the USB drivers don't load.
If it's this issue you will see red X or some other warning in the device manager. It's due to the MB supplied drivers being not updated for SPs of XP. And without those drivers loaded into XP update doesn't recognise the USB systems correctly.
Fis is something like...
Load XP (no service packs)
Load motherboard driver
Load service packs.
If it's just being able to copy a file to the plotter you should be able to find a utility.
http://www.rdpslides.com/psfaq/FAQ00056.htm
http://geekswithblogs.net/dtotzke/articles/26204.aspx
http://www.ozgrid.com/Services/windows-printing-applications.htm (print on USB devices or remote devices over a LAN, even if the original
application can not print on that type of device)