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changing windows password without re-installing windows
I have had to do the very thing you asked about many times. You should go to http://www.pendrivelinux.com/. Their program used to be MultiBootISOs. I still use that. YUMI supplants MultiBootISOs. Install it and you can add many ISOs to your USB stick, and it's all run off a GUI front end to GRUB. I have Hiren's Boot CD, BackTrack, DBAN Drive Nuker, "Offline NT Password & Registry Editor", and others on my rescue stick. I select "Hiren's Boot CD ISO", and I get another menu containing "Offline NT/2000/XP/Vista/Windows 7 Password Changer". I select that. A linux kernel is loaded and I am taken straight to the text-based password changer. Select the disk (/dev/sda or whatever), it usually finds "Windows\System32\config, you hit "Enter", then you get the "User Edit menu". It enumerates the users for you. Administrator is the selected user, but you can select any valid user. You can clear the password, edit the password, put the user in the local box Administrators Group, or unlock a locked account. I usually clear the password for Administrator. Perform your operation and reboot. Log on as Administrator or as the appropriate user.
If you have the need for shared passwords, by far the best way to deal with such issues is to use a shared password authority source that is acceptable to and easy-to-use by all concerned. Windows, for example, uses LDAP (calling it "Open Directory") and it also has a few other older, legacy protocols. Linux can, through the magic of PAM, interface with any of them, exactly as you direct. Systems like Apache and so-on also speak this language, which is marvelously convenient in a corporate-intranet setting. Even Internet Explorer ("gaaa-a-a-a-ack!!") is pretty darned slick in a Windoze-only world.
So, in other words, instead of trying to "change the password over there from over here," arrange for all the systems to obtain their answers from a single source that can be applied to every system simultaneously. This also greatly smooths the way for other things such as "group memberships," "permission to do this-or-that," and so on. There's just one place where you have to manage this information, and everyone else is asking for answers from a single source, so they're always up-to-date.