# Access USB In virtualbox ruinning Windows XP [duplicate]

I have Windows XP as a guest in virtualbox and Ubuntu 12.04 as a host. I want to access the usb from windows xp, so I followed the instructions in this topic :

How to access USB in VirtualBox running Windows XP as guest OS

I installed the VirtualBox from the Oracle site, then I installed VirtualBox 4.0 Oracle VM VirtualBox Extension Pack

Then I added myself to the vboxusers using this commande : sudo adduser aimad vboxusers

But when I go to add the USB I get the message : no devices availaible, as in this picture:

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