Best way to migrate physical bootcamp into a true vitual machine

Hi,

I have an old windows xp installed that is on an external bootcamp drive/partition. Set up as a bootcamp VM, windows boots/runs fine, but I'd like to create a physical VM on my hard drive out of it rather than run it off external disk.

I've tried the following:
- Ran the bootcamp partition as a VM and used the parallels transport agent to export it as a PVM file; However what happens is when I open it up as an external file using the external storage migration method, it gets halfway through the process then tells me that I need to login but the messages I get are:
No boot device is available, press Enter

indicating that the OS is not found.

I also tried creating a disk image (using disk utility) but there seems no way to import that either.

HELP!!!!