New
#40
Before you do anything, check which partition is the active partition. It can be C or D. If it is D, no need to move the bootmgr.
For any further discussion I suggest you post a picture of your Disk Management.
Other than that, your logic sounds OK. Just make sure you image the XP and data partitions before you do anything. Losing a partition is easy and has happened to the best of us.