How to unlock a user and change it's password in Windows 7

I successfully used NTPWEdit v0.3 launched from an XP-based Ultimate Boot Disk for Windows to unlock and change the password of the administrator user on a Windows 7 (Ultimate, 32 bit) PC. It's a GUI tool and is based on code from Offline NT Password & Registry Editor.

I'm writing this down as a reminder since UBCD4WIN contains Sala's Password Renew too, but there are reports of incompatibilities between Sala's tool and Windows 7 (at least some people complained in Sala's forum that changing a Win 7 user's password with the tool resulted in a messed up system ... the password could not be altered after it was "touched" by Sala's tool).