I know what you were referring to. The issue is that if a Windows system is properly configured, if you remove the Windows password - or change it - using a third party tool then files that account has access to become unreadable if encrypted with EFS - a built-in Windows tool.
Lastly, the vast majority, if not all, ways to remove or change the Administrator password - to my knowledge - require physical access to the machine in question.
JamesNT