Kerry Brown wrote:
DL is right. I assumed you had already done a repair install. If you haven't
then this is the problem.

http://michaelstevenstech.com/XPrepairinstall.htm

No, I did no Repair Install. I gather that I should
let it try to boot to the 'not-prepared' drive,
and interrupt it along the way, to do a Repair
Install. Well, I'll read that Stevens article again,
but I was less than enthusiastic about the prospect
of doing it when I studied it before.

My "Plan B" is to make a clone of the new system,
and then all of the BIOS and MBR and stuff will
match. As time goes on, the old back-up clones
have less and less likelihood of ever being needed.