I found how to get USB to work in XP... its a bit messy however.

The trick is to open up Device Manger (rick click on My Computer and go to Properties). You will see the RioCar listed under USB. Right click it to disable it. Then, open emplode and try to connect to the RioCar via USB. As emplode is searching for the player, right click RioCar in Device Manager and enable it.

It might take 1 or 2 tries to get the timing of it. It's almost as if XP is grabbing hold of the RioCar's usb driver. By enableing it only when emplode is looking for it, things somehow work.

I figured this out in a panic one day when I showed up to run sound for an improv comedy show the day I bought my new laptop w. XP. I forgot my crossover cable and only had the USB w. me.