I wouldn't trust a reset. You need to wipe the HDD (DON'T WIPE AN SSD!!!!) and do a clean install of Win10. There are other things you might do, but the only correct one is a wipe and clean install.
Use DBAN Disk Wipe for the wipe. (https
/dban.org/)
This tells you how: http
/www.techfleece.com/2013/08/22/how-to-securely-wipe-your-hard-drive-using-dban/