Fedora Installation :: F12 - Builds And Source Shown As Broken Links

I had F11 which was working OK'ish on my laptop and decided to upgrade to F12 when it was available. This was not too successful and I started getting problem with updates to the extent that I could not install any as I got errors which stopped the updates. Bit the bullet and backed up all the data then wiped the disk and started from a clean downloaded DVD of the full F12. Still getting problems running the updates (output below) and trying to install/run VirtualBox is also failing (also below). The build and source mentioned show as broken links, where do I go next?

Update errors -
Error Type: <class 'yum.Errors.RepoError'>
Error Value: Error getting repository data for installed, repository not found
File : /usr/share/PackageKit/helpers/yum/yumBackend.py, line 3125, in <module> main()
File : /usr/share/PackageKit/helpers/yum/yumBackend.py, line 3122, in main
backend.dispatcher(sys.argv[1:])
File : /usr/lib/python2.6/site-packages/packagekit/backend.py, line 710, in dispatcher
self.dispatch_command(args[0], args[1:])
File : /usr/lib/python2.6/site-packages/packagekit/backend.py, line 657, in dispatch_command
self.update_packages(only_trusted, package_ids)
File : /usr/share/PackageKit/helpers/yum/yumBackend.py, line 1948, in update_packages
signed = self._is_package_repo_signed(pkg)
File : /usr/share/PackageKit/helpers/yum/yumBackend.py, line 1437, in _is_package_repo_signed
repo = self.yumbase.repos.getRepo(pkg.repoid)
File : /usr/lib/python2.6/site-packages/yum/repos.py, line 121, in getRepo
'Error getting repository data for $s, repository not found' $ (repoid)

VirtualBox install log error
Error! Your kernel source for kernel 2.6.32.9-70.fc12.i686.PAE cannot be found at
/lib/modules/2.6.32.9-70.fc12.i686.PAE/build or /lib/modules/2.6.32.9-70.fc12.i686.PAE/source.