"No GRLDR" message after F18 installation...

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http://forums.fedoraforum.org – I just clicked through the LiveCD installation... I also have another Windows installation, it would be awesome if that didn't get wrecked... oh well, but anyway: What is this? I picked the recommended disk setup (I think??), because it seemed okay, it had the correct /home and windows root points, but it was a really confusing UI. Anyway, what's up with the "GRLDR" thing? EDIT: oh, it doesn't boot. It's just a black screen with that message. (HowTos)