I am trying to run Virtualbox on my fresh install of f11, i686, try to follow the error messages to solve this issue myself and using the forums but unable to solve this issue.
i get this>>
Kernel driver not installed (rc=-1908)

The VirtualBox Linux kernel driver (vboxdrv) is either not loaded or there is a permission problem with /dev/vboxdrv. Re-setup the kernel module by executing

'/etc/init.d/vboxdrv setup'

as root. Users of Ubuntu, Fedora or Mandriva should install the DKMS package first. This package keeps track of Linux kernel changes and recompiles the vboxdrv kernel module if necessary.

then i get this>>>
[Ohio@f11-v3016us ~]$ su
Password:
[root@f11-v3016us Ohio]# /etc/init.d/vboxdrv setup
Stopping VirtualBox kernel module [ OK ]
Recompiling VirtualBox kernel module [FAILED]
(Look at /var/log/vbox-install.log to find out what went wrong)
[root@f11-v3016us Ohio]#

then i get this>>>
ttempting to install using DKMS
removing old DKMS module vboxdrv version 3.0.2

------------------------------
Deleting module version: 3.0.2
completely from the DKMS tree.
------------------------------
Done.

Creating symlink /var/lib/dkms/vboxdrv/3.0.2/source ->
/usr/src/vboxdrv-3.0.2

DKMS: add Completed.

Error! Your kernel source for kernel 2.6.29.4-167.fc11.i586 cannot be found at
/lib/modules/2.6.29.4-167.fc11.i586/build or /lib/modules/2.6.29.4-167.fc11.i586/source.
You can use the --kernelsourcedir option to tell DKMS where it's located.
Failed to install using DKMS, attempting to install without
Makefile:147: *** Error: unable to find the sources of your current Linux kernel. Specify KERN_DIR=<directory> and run Make again. Stop.

this is about where my knowledge ends, i have tried many other command lines with no further assistance.

Try installing "kernel-devel"

You probably need kernel-headers too