[Aks@EagleEye Desktop]$ sudo rpm -Uhv VirtualBox-3.1-3.1.0_55467_fedora12-1.i686.rpm 
warning: VirtualBox-3.1-3.1.0_55467_fedora12-1.i686.rpm: Header V4 DSA signature: NOKEY, key ID 6dfbcbae
Preparing...                ########################################### [100%]
   1:VirtualBox-3.1         ########################################### [100%]

Creating group 'vboxusers'. VM users must be member of that group!

No precompiled module for this kernel found -- trying to build one. Messages
emitted during module compilation will be logged to /var/log/vbox-install.log.

Success!

[Aks@EagleEye Desktop]$ rpm -qa | grep VirtualBox
VirtualBox-3.1-3.1.0_55467_fedora12-1.i686
[Aks@EagleEye Desktop]$ su -c '/etc/init.d/vboxdrv setup'
Password: 
Stopping VirtualBox kernel module                          [  OK  ]
Removing old VirtualBox netadp kernel module               [  OK  ]
Removing old VirtualBox netflt kernel module               [  OK  ]
Removing old VirtualBox kernel module                      [  OK  ]
Recompiling VirtualBox kernel module                       [  OK  ]
Starting VirtualBox kernel module                          [FAILED]
  (Cannot create device /dev/vboxdrv with major 10 and minor  57)
[Aks@EagleEye Desktop]$ groups
Aks vboxusers
[Aks@EagleEye Desktop]$