does anyone use Virtual PC to load/update castle's software?

[ClodMaxx]

i have a mac, and installed virtual PC with windows XP home. the problem is USB connectivity with castle link. i plug it into any USB slot (USB cable is plugged into the castle link) and all the lights turn on. yet castle link software doesn't recognize anything is plugged in. when i click on USB settings, castle link is one of the options to click to activate... yet when i click 'ok' with it checked, it 'unchecks' it. meaning, when i go back in, castle link is unchecked yet again.

i'm quite confused. and frustrated. any help would be vastly appreciated. (didn't want to put this in castle's section as it's not so much a problem with the software - it's with virtual PC)