The tool discussed here is for HOME USE ONLY! It is NOT be used on systems that do not belong to you. Any problems arising from using Kon-Boot are YOUR responsibility. After all, no-one is forcing you to Kon-Boot!
We have all been there. Passwords, or lack of.
Luckily, there is a tool now available that will allow you to bypass Windows or Linux operating system security and allow you to log on without knowledge of any of the operating system passwords.
What's more is this tool will allow you to do this without making any changes to the operating system installation itself. Instead, it makes changes to the operating system as held in memory on the target machine. Once the machine is rebooted, those memory changes are lost.
The tool is called Kon-Boot, developed by Piotr Bania. Piotr's Website
I'm not going to tell you how to use it. Instead, I'll point you towards some videos of Kon-Boot in action.
If you are interested in learning more about Kon-Boot, then have a look at Claus Valca's blog post here. Well worth the read as Claus has spent quite a bit of time on this.