Internet Sharing not working on desktop PC

[kitts]

Sorry to hijack this thread, but it is related question.

I am having trouble tethering from my Sun Virtualbox(host : XP and guest XP)
I am able to tether from my host XP machine. But the guest XP system gives the error "The USB device is busy with previous request". This error goes away if I add the filter for USB HTC Generic RNDIS device, with all fields empty and only Name and VendorID has the text values in it. But the windows device manager shows as the device could not start with a yellow exclamation mark. Error code 10.

By the way, I am able to connect to my guest XP using Active Sync, and also as Mass Storage device. I am using Active sync 4.5(reinstalled couple of times)

I hope somebody else may have come across the same situation, and found a solution. This will enable my browsing while on work, safely!

Thanks guys.