Thanks for that link and have downloaded that package. At this early stage I will leave things as they are and do a lot more tests on the computer as it is. See if it holds ok with the sound. The old...

Now I don't quite know what happened but I went searching for Realtek with those C658 details and found a couple. I then deleted all Realteck ones I had and reinstalled that original one of yours...

Gee what a heap of information...the following is what I thought you would like to see:
PCI/PnP Audio= Realtek C658@ATI SB400 - AC 97 Audio Controller
Audio Codecs=Fraunhofer iis MPEG Layer-3Codec...

It's "On Board" sound, enabled or disabled via the Bios. That's why I have been using a USB plugin unit for sound TNX

Thanks for all your help but not having any luck with any.
Still says no audio installed and still just "Multimedia Audio Controller" with the yellow tick showing in Device manager.
ran that "diver...

Did that, and got into safe mode ok and tried to install the software you recommended but nothing appeared in device manager.
Only shows as "multimedia audio controller which will not update. I then...

before installing these new drivers would I have to turn the audio back on in the Bios?
If I do that the computer will just lockup again. Can I load these new drivers first and then turn the audio...

Just found this post which is probably the answer
Realtek AC97 drivers bluescreen immediately with Win10 32 build - Microsoft Community
KG

Just updated to w10 from 8.1 (on my spare computer) and it keeps going to the Blue Screen of Death saying......
" Kmode Exception Not Handling RTKVAC.SYS" and reboots. This happens about every four...