SR-71 Blackbird said:
Unless it's a retail copy of XP , it's locked to the first board it was installed on.
SR-71, I think you are entirely correct. I have 4 computers that were built for me with Win XP Pro on them. On 3 of them I copied C Drive to D before installing Win 8.1. This 4th one was the first one that I put 8.1 on and didn't think in advance to copy XP to Drive D.
I think my best course of action is to buy a retail copy of Windows XP for my problem computer. My reason for all of this is that I have tons of photos using Canon Zoombrowser EX. Canon software worked beautifully in XP, but not satisfactory in Windows 8.1. Canon says they are not going to fix it for 8.1. Thanks a bunch for your help.