VPC Windows XP Pro

I recently had major trouble upgrading Virtual PC on my Apple
PowerBook to v7. In the course of converting, it screwed up my
existing virtual machine which now tells me a file called
\system32\ntoskrnl.exe is “corrupt or missing.”

With help, I extracted the XP Pro environment off my VPC6 disks
and installed it in the VPC7 environment. All well and good,
except it’s asking for the Product Key. Naturally, I can find the
licence documentation but not the COA with a valid key.

What is the best route to recovering a valid key for this fully
legal copy, and is it any different to a full copy of XP Pro in this
respect? It’s clearly not a unique number.

Will I need further information to complete the installation?

Thanks

Andy