I'm pretty sure this is a bug, as I have a Dell too and the same exact thing happened to me. Here is what I did to correct the problem:
1.) Pop in the Rescue CD and reboot, booting from the rescue CD.
2.) In the command line, type: linux rescue
3.) Then type these commands:
chroot /mnt/sysimage <ENTER>
grub-install /dev/hda <ENTER>
I hope this works for you as it did for me!