Single HD - Vista - C / XP Pro - D

I've removed Vista from Drive C and want to make XP the only OS on the system and merge the two partitions together. Of course I wasn't thinking and now the system won't boot as I made the Drive C partition inactive with Acronis. Thoughts on how I can remedy this?

I have an image of the Vista drive before I did this so I could go back to that and start over if need be.