You fix grub by editing /boot/grub/menu.lst file. To do that you need to boot the system with linux, and then use a text editor to modify and save the file. On the Fiesty install CD there are other options besides install. One should allow you to boot as a live CD. Once you are booted, you will probably have to mount the partition where the /boot is. There are plain text editors to run and change the file.
I suspect you have messed up the partitioning, by what you have said.
You should be able to restore the MBR if you have your Windows CD. You boot it as an install CD and ask for a command prompt. It has been a very long time since I did it. Search the board for a How-To or have a look in the Wiki for instructions on restoring the MBR. That will get windoze booting, ( assuming the windoze partitions are not screwed up ) but won't fix linux.
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