I've a vague success to report. The CPU has been replaced with a Sempron 2400+ which works fine with the Mobo.
I turn the PC on, boots up fine, however when it comes to booting Windows up it restarts just at the point when the loading screen would show. I watched the boot up process with the command line option and it restarts at hitting Mup.sys on the boot up. I am planning on reinstalling Windows and seeing if I have a success from there.
ASI