My XP install in Virtual Box under Mint 14 Cinnamon had
a broken USB. Turns out you must be a member of the
vboxusers group. Don't know why virtual box installer
did not fix this. I fiddled with the user manager for a
long time before deciding I could not make it work.
But a terminal window graced with the command:
sudo usermod -a -G vboxusers myusername
did the trick (sub your user name for myusername).
It is necessary to reboot the whole system after this
change, but then the USB link to XP took off and
works like a charm now.
Remember, GUI's are nice, but they are not the only
way to get around in Linux. I hope the user manager gets