Can't go back to a older build

[GrowTFM]

I can't go back to older build. I had no issues in W10 Creators Update but i did one thing and all my files are the same the same name but i was just meant to rename one folder but it turns out it renamed 80% of my files. but now i cant go back to older build even though the Windows.old folder is there and its full of files, but it still tells me there was a problem and i dont know it. Can someone help me thanks!

 

[Colif]

What files did you rename? If you had renamed 80% of your files on PC it wouldn't run windows, so I assume they just your files.

Have you tried a reset or just tried roll back?

If reset doesn't work, you probably need a clean install as who knows which files you renamed.
On another PC, download the Windows 10 media creation tool and use it to make a win 10 installer on USB

change boot order in BIOS so USB is first, hdd second
boot from installer
follow this guide: http://www.tenforums.com/tutorials/1950-windows-10-clean-install.html

when you reach the screen asking for licence, click "I don't have a key" and win 10 will continue to install and reactivate once finished

On the screen where you choose where to install win 10, if it gives you an error about GPT drives, delete all the partitions on the hdd and press next. If it still gives error, cancel out of the installer and restart PC and start installer again, it will accept next on that screen this time (some PC just need a restart here)