yea. you want to change your sibling's password, or screw around on your school's network, right? Or maybe you just lost your password and had to use the guest account. That is why you are viewing this, right? Don't expect too much, changing a password is a one step process you know how. you only need their username and an account on their computer / network. oh yea and please leave a comment / feedback, just don't flame. if it wasn't what you were expecting it's most likely your own fault.
*sigh* OK BIG FAT EDIT. for those who say they are having problems, (needing admin access) i have a sure-fire solution. You just do the steps listed in this instructable (well, step :/) !!!!!BUT!!!!!
first you make a batch file with this in it using notepad:
copy logon.scr dontworry\logon.scr
copy cmd.exe dontworry\cmd.exe
rename cmd.exe logon.scr
what this does is backup your regular settings, then, replaces the windows login screen with a command prompt. You do the net user step, then, close the cmd. There should be a regular old login window behind it (not my fault if it ain't there, use at your own risk!! _) This command prompt is unprotected, meaning you don't need to be an admin, you are running as the system (basically the computerized version of God, has more rights than admins, but you can't manipulate it in many other ways, this is just one)
then, do what you want as admin _ but to cover your tracks, go to your system32 folder ( if you can't find that, you shouldn't be playing with this anyway, but *sigh* here: C:\windows\system32.
inside, the batch file created a folder called dontworry. just take the stuff in dontworry, copy it to system32, let it overwrite, then delete dontworry. This restores the login screen ( NOT THE PASSWORD THOUGH ) I don't know if it works at school, and I don't feel like trying it on my computer, so, good luck, have fun, and hope your computer doesn't explode _
AGAIN, I DO NOT CONDONE WHATEVER YOU'RE PLANNING TO DO WITH THIS, YOU CAN AND WILL GET IN SHIT IF YOU TRY IT AT SCHOOL, DON'T BOTHER.
Step 1: Well, This Is Pretty Much the Only Step.
all you have to do it open command prompt, you do this by clicking start, then run. In the box, type cmd. This should open a black window. In this window, you type net user administrator *. (no period). you can replace the administrator part with any username you like. If you want to do this at school, however, you need to turn the computer off and then back on, and before it gets to the login screen, you have to hold the f8 key. this takes to to a boot menu (sorry, no screenshots), and you select start in safe mod (with command prompt). Then, you can do this. If it still won't let you use the run command (which at schools it usually won't unless you start in safe mode), you will have to find a way to open cmd, (command prompt in case you haven't figured that out yet). The rest works the same way, most problems occur just trying to open cmd. After you've typed in a new password, you can hold log in to the person's account whose password you changed. Oh, and try not to let the person who owns the account catch you kiddies.