- Download the Fedora 9 RPM for your architecture from here.
- Install the RPM and then install gcc, make, kernel-headers and kernel-devel.
- Make sure you have all updates installed.
- Add yourself to the vboxusers group or just add read/write permissions to "/dev/vboxdrv".
- Open a terminal and run the following command:
su -c "/etc/init.d/vboxdrv setup"
Run step 5 again after a kernel update. Unlike Ubuntu, the USB support in virtual machines is preconfigured and works without errors.