Thanks Martin, with your help I have finally got it working again
Much appreciated ... I'll relay my steps in case it helps anyone else:
1) Goto Device Manager, Click "View -> Show hidden devices"
2) Expand "Non-Plug and play devices"
3) Identify the following drivers:
on each one, right click, select "Properties", click "Driver" tab, click "Stop" button. Close down this window. Right click driver again, this time select "Uninstall". You will be prompted to restart, DO NOT RESTART for any of these!
4) Go to \Windows\System32\Drivers then find the 4 files above and delete them!
5) Restart computer.
HWiNFO64 will now work for sensors section
It is important the files are deleted/moved in step 4 as otherwise I found that hwinfo would still crash after reboot even they they no longer appeared in device manager. After the crash they would "magically" appear back in the device manager window.
BTW, if of interest to anyone, I found these 4 files by looking in
\Windows\System32\Drivers and then adding "Company" and "Copyright" columns to the view in windows explorer. They all appeared with "SuperMicro" except for superbmc, this was the only empty one, I found it's digital signature was Super micro.
Only one of these files may have needed removing? I could try and find out but prefer not to as BSOD could cause other problems in my system! This is for anyone reading this with same problem to try