Grub-rescue for LVM encrypted partitions

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http://forums.fedoraforum.org – Windows messed up my boot partition on my dual boot system (Windows 7 and Fedora 18). Now after each reboot the grub loader starts with: error: no such partition. grub rescue>What can I do to get Grub2 working correctly again? I have a Windows partition (sda1, sda2 and sda3) and LVM encrypted partitions (sda4), which include a home, boot, swap and root partition. I also tried to mount the encrypted LVM partitions to at least make a backup (using the Fedora Installer DVD), but I cannot mount the partitions as I can not find out how to mount them (fdisk -l only says "/dev/sd (HowTos)