Recover Second OS (Dual Boot)

I have two drives with C: being the first, and D:,E:,F:, and G: being the second. C: and D: were both bootable XP drives.
I had to do a format/install on C: last night, and now D: is no longer bootable. (Boot.ini changed)

Is there any way to set D: back up where it is bootable again? I really don’t want to have to format another drive and lose all the data on D:, since it was the OS I used the most and have SO many settings I can’t afford to lose. I have Ghost and R-Drive Image to use if needed.