USB dropout problems! Help!

Hi, my USB devices work fine when working in OSX and in the virtual pc environment. however the problem starts when i shut down the virtual pc and return to OSX. The USB devices completely drop out and stop working! Its so annoying!
Does anyone know why this is and how I can stop it happening?
Thanks
Lee.

There are various things you can try depending on whether you use a Mac or Windows.
However, you've left out this info.

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