I've never had a login password on any of my machines and it's only recently that I had to create a Microsoft account - I forget now for what.
I forget now how I side stepped the need for a login password, but if you are prompted to create a password then just press enter/OK which should bypass it.
I think you may need to do another clean install or if it's a branded machine, then factory reset it.
The factory reset will also remove any abnormalities/infections your machine has developed.
My machines were updated from Win 7 and I set the privacy/security settings to minimal so as little info as possible was sent back to MS.
The one thing I don't like about Win 10 is that you have to boot into Windows to access the advanced boot options, whereas in Win 7, you could tap F8 as you switched on which made repairs a lot easier when you couldn't boot.
The alternative is to boot up with Win 10 install media and when you get to the Install screen, click on Repair your computer which will give you Troubleshoot/Advanced boot options to select the factory reset option.
You'll probably have to remove any additional drives and ensure you have the product keys for any paid for programs you had installed.
You can create Win 10 install media after reading -
https://www.microsoft.com/en-gb/software-download/windows10You don't need a product key to download the MCT unlike for Win 7.
It defaults to creating a bootable USB, so plug one in before downloading.
I use 16GB USBs but I think the min required size is 8GB.