Hi Geoff - have been attempting to recover this system for 48 hours now with Microsoft on the other end - I've finally decided to revert back to Win 7 on this system - they can keep Windows 10 and it auto updates.
When I| eventually got the system to boot to desktop at 2am this morning, I installed bitdefender 2018 from bitdefender central - what did windows do after that? It updated itself and - wait for this - deleted the whole bitdefender installation... :wtf:
There was a major update last week of win 10. The correct way to handle update Tuesday or any large update is to NOT run any other software while the update process is underway. That means you have to take control of the update process and not rely on any of the auto settings. Since I switched to such a process I have had peace with windows updates.
Because bit defender is no longer supported maybe?? Have you checked on the MS website?
Reverting back to WIN 7 is not the way to go.
Rather before you try again look at what you are trying to do, what other sw is installed and how you sign on and what is the reliability/quality of your Internet connection.
My recommendation would be to download the latest version of WIN 10 onto an ISO medium
Backup ALL your critical files, then uninstall ALL third party software before trying a re-installation of WIN 10 Pro. You could even consider a complete reformat of the HDD before any attempt to re-install. This will ensure that there is no left over "stuff" from the previously failed isntalls hanging around.
Make sure you have all the keys required as a safety measure.
As soon as WIN 10 is working again. Create a local account and stop signing on with the MS account as the default. Only use the MS default when it is absolutely required. Especially if you have a rather erratic Internet connection.
There is very little wrong with the latest creators version of Windows 10. ( No sw is ever perfect). I quickly discovered that on PCs that have been customized with other cards etc, that you have to tread carefully. Know what drivers are required for any customisations. Read up on what you have to do to ensure WIN 10 install correctly for such setups.
I regularly get people bringing me their laptops for updating and I am absolutely horrified at all the cr@p that gets installed on PCs. So I make it clear every time that I will only take on the task of cleaning up the PC if the owner agrees that ALL third party sw will be deleted and only sw that I have vetted will be re-installed afterwards. This process works every time.