One other thing ... I have a separate HDD where I store all important documents. So fearing that something could go wrong during these changes, I decided that I would just unplug it instead of backing it all up.
However, when I do this, the PC will not start-up and gets stuck just after the initial splash screen
Any ideas ....
You said you are going to format, so dont worry about the errors.
Use this guide to install Windows 10:
Download the ISO from here:
https://tb.rg-adguard.net/public.php 100% safe and unlicenced, direct from MS (use the english one not english International assuming you have a US keyboard)
Then grab a empty 8GB USB drive, once downloaded, download a program called Rufus, install rufus and insert the USB drive. Locate the ISO, dont worry about all the options. Just make sure ISO is selected from the drop down.
Go to your motherboard manufacturers website and download all your drivers. (I mainly only download VGA, Chipset, Ethernet, Audio and Intel management engine (Intel ME)). Copy these to your backup drive. [Send my your teamviewer ID and password via PM should you need help up until this point]
Shut down your PC and unplug your backup drive. (make sure all your important docs are on your backup drive!)
Reboot the PC and tap F9 to select boot from USB.
Get into windows install and select custom installation.
Select your drive and delete all the partitions then select next.
Install will continue.
In the setup it will ask you to connect to a network, say "I dont have internet" then on the next screen it will say "continue with limited setup" in the bottom left, click it.
Choose the options you seem fit.
Once in windows wait ~10 min and dont connect to the internet.
Safely eject USB and reboot PC.
Connect backup drive and install drivers one by one. Reboot after the last one is done.
All done.
