What Do We Do With Regedit Command In Windows Xp?

The answer is two fold:

1. If you don't know what regedit is or does and you want to potentially make your system inoperable, use regedit.
2. If you do know what regedit is and does, it allows the changing of settings that have no interface, removal of programs, changing of system behaviors and much more.

the registry is essentially a database of all of your Windows settings that describes where things are installed, how they are configured, what they do etc. One of the quickest ways to kill a working system is to accidentally do something incorrect to the registry.