Fedora 18 VirtualBox error Kernel Driver not installed(rc=-1908)

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The advice in the other answer, to reinstall virtualbox, is probably overkill, and may cause you to lose data if you have pre-existing machines set up in it like I did. I found this in another thread that provides a very simple and fast solution without a reinstall. I can't post links, though, so here's a copy-paste with some additional clarification instead (origional poster was aestu on fedorapeople).

Get your version kernel:

$ uname -r

Then find the corresponding kmod-VirtualBox-* package:

$ yum search kmod-VirtualBox

and install it:

$ yum install kmod-VirtualBox-#### appropriate version from list in previous step

Finally, run:

$ /etc/sysconfig/modules/VirtualBox.modules