Thanks Stephen,
Your thoughts, suggestions and interest are about all that's keeping me going right now - I was a toothbrush away from throwing myself in front of a bulldozer. :) :)
Sorry, but the Nvidia chipset that uses the nForce 750i drivers are absolutely essential as they're an integral component of the motherboard, there's no way to bypass them in the BIOS - a Vogon construction ship could certainly do the job nicely and I'm just short of calling in that option! :) :)
Back home now so progressing with some more tests.... After downloaded the 32 bit ISO of 16232 from the Microsoft web site and using a Rufus USB; I've run out of DVDs :( ; I've been able to install the 32bit version of build 16232.1000, switched from the Slow to Fast ring and, as I write, the update to build 16241.1001 is progressing - downloaded and 76% through the installation phase. Assuming that completes successfully I'll be in the same state as @thecreator.
I'll go back to Microsoft and download the 64bit version of build 16232 and use Rufus to create a USB and see it that works.... the DVD ISO I have of that build was created using UUPtoISO so perhaps that route will be successful... if it is I'll be delighted and it'll get me back on the Fast track again..... having skipped the builds in between 16199 and 16232...... but that's for tomorrow.
Cheers