You're hitting an issue installing the VB kernel module, because it needs the sources for your kernel! A quick flick using google reveals that the kernel sources are no longer included in fedora 9, and the package kernel-devel should give the ability to compile external modules. You are trying to compile an external module, but do not have this package included. Take a look at section 9.4 at the bottom of this page: http://docs.fedoraproject.org/releas...sn-Kernel.html
yum install kernel-devel
or whatever the command you were using to compile the external module.
Hope that helps, I don't run Fedora myself, but used to run a CentOS box which would be quite similar.