Grub prompt instead of boot menu

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https://bbs.archlinux.org – Well, I am back to square one, just this time it is worse.Last night I managed to restore proper grub with Rescatux auto restore. However, after that I decided to install windows XP on a spare partition, which of course overwrote MBR. I though I will be able to restore it again with Rescatux, but no. I can't. All it gave me was GRUB prompt in place of grub boot menu.But there's more. This time, even if I boot from some livecd, like BackTrack, and try to restore grub, it doesn't work because grub cannot mount any partitions. They also don't get automatically mounted on livec (HowTos)