Download VirtualBox first
if you done this
rpm -ivh VirtualBox -1.6.2_31466_fedora9-1.x86_64.rpm
get this result:
libqt-mt.so.3()(64bit) is needed by VirtualBox-1.6.2_31466_fedora9-1.x86_64
then you need to do this step:
sudo yum install qt3-3.3.8b-12.fc9.x86_64
if you see this :
"VirtualBox kernel driver not installed. The virtual kernel module was
either not loaded or /dev/vboxdrv was not created for some reason.
Re-Setup the kernel module by ‘/etc/init.d/vboxdrv setup’ as root
VBox status code: -1908 (VERR_VM_DRIVER_NOT_INSTALLED),"
Need to do this: