Are you saying that XP used to think of itself as D:\ and now you've cloned it to a new place it thinks of itself as a different letter ?
If so, this is not a problem to be solved by fiddling with the boot. You've got to fix the OS so it resumes using the letter it was when you installed it, before you moved it.
Have a read of this


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of the WIndows7 partition when I am in Windows XP. It tells me that I can not change the drive letter for a bootable partition.



