Take a look at this article. Be sure to read it until the end up until the part that says "Free Virtual CDROM Drive..." Hopefully some tips there for ya, particularly the last part about removing devices and letting them be rediscovered.
I'm using Window's XP and have a question. When I go to Windows Explorer, I see TWO USB drives an F & a G drive, I do have an F USB Thumb Drive installed BUT I don't have a G drive, when I right click on the G drive, the properties show that it's not really there. It has no Space information.
How do I remove this entry in Window's explorer, I'm not sure why it's there and is confusing! Thanks for any help!