Thank you Ray
That's what I thought, was told by store that I'm buying latest tech version board from that it may cause problems. I can reformat Vista primary if it doesn't work any better than it did last year, as they claim it now runs much better, & swap that drive to slave.
It will be same XP reinstalling on the same drive it was on, which was a new install on formated disk on that drive originally.
Thanks again, Terry