GRUB read error (Urgent)

[cactaur]

Hello, I'm currently using Ubuntu Dapper Drake. I upgraded it a while ago
from Breezy Badger. So, my story goes, I was trying to find a way to boot my
recently installed Fedora Core via grub. Someone recommended that I
reinstall grub from the Dapper live CD. I did that, but when I rebooted, I
got an error that said, "GRUB read error", then my hard drive made some
sounds. I can't even boot up any of my operating systems now, and my only
method of communication is via live cds. I use grub 0.97. I tried to fix in
many ways, I tried booting from Super Grub Disk, it couldn't fix it. Things
got a little better after I installed grub from the breezy live CD, after
that, I was able to get a command-line-ish prompt, instead of just a GRUB
read error. If anyone can help me, it would be VERY appreciated. Thank you.
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