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You can do interesting things with Windows 8 and 7. For example you can tether your connection to other devices without installing 3rd party software, enable Administrator account etc.
## Removing password without Administrator access.
This can be done easily with [ntpasswd]. It also has other features, but I only recommend using the "blank password" / "remove password" function as it's the most working one. This feature should work with Windows XP too, but I have only tried it with 7 and 8.
I don't type usage instructions here, because [ntpasswd] has enough good documentation and it's easy to use anyway.
[ntpasswd]:http://pogostick.net/~pnh/ntpasswd/