ERD Commander boots from a CD, DVD, or USB into a graphical Windows-like environment, allowing you to access a "dead" system's files and registry without booting into the primary OS. Key built-in tools include: ERD Commander – Free Trial from Microsoft - GeeksToGo

Winternals Erd Commander 2010 remains a valuable resource for anyone dealing with Windows troubleshooting and recovery. Its comprehensive set of tools can breathe life back into seemingly dead systems. While obtaining a free version might require a bit of searching, the utility it provides can be invaluable. Always ensure to use such powerful tools responsibly and ethically, respecting software licensing agreements and the security of the systems you interact with.

The most famous tool, which allows you to reset a local administrator or user password without needing the original one.