This topic is now being covered by more recent queries so will follow these new lines and learn. Unfortunately, in my various attempts at software transfer my PC closed down, could only enter Safe Mode and Activation Window was Blank! Followed Microsoft guidance from MS site to recover Activation Window, then did a full Windows XP re-install with guidance from MS Technical Support and their Activation group since original Product Key (3 years old) wouldn't work. Am now fully back working, no loss of data!!
In addition, one of my original problems has disappeared - I now have DMA working on both HDs.