If your OS is vista, follow the steps in the following link
http://www.vistax64.com/tutorials/102005-reset-user-account-password.html
If your OS is MAC, then follow these instructions,
Although there’s no real way to recover a lost root password, youcan change the root password even if you do not know the current one.You must have physical access to the machine in order to accomplishthis task.
1. Click Restart at the login window
2. While the computer is restarting, hold down “Command-S” until yousee text scrolling through the window. This boots the computer intosingle user mode.
3. At the Localhost% prompt type:
/sbin/fsck -y
/sbin/mount -uw /
/sbin/SystemStarter
You will then see various services starting up.
4. When the Localhost% prompt reappears, type:
passwd [username]
It will then ask you to type the new root password twice, so do so.
(Though I’ve not tried it, it appears you can type niutil -list ./users to get a list if users if you do not know the username….ifsomeone wants to verify this, I would be most appreciative).
5. After entering the new password, type:
reboot
6. At the login window, enter the username with the new password.Once you are logged in, you can use the Multiple Users application(/Applications/Utilities) to change your user’s password, or create anew user account.
Note: this may not work for newer versions of OS X; I think they didsomething about it in a security update. I hope this helps you with Macintosh password recovery.
Hope this helps,
~regards,
Jegan
I assume that this is Window XP or Vista. If so I hope you have another user account. If you have another user account you can get in and create another account to replace the one you just lost. Make sure to give it administrator rights. So system designers make a backdoor user named Admin with a password. I make mine as Admin and no password. Just hit enter. Maybe you can log is as one of them. Otherwise good luck finding the password. There really isn't a way around it that I know of. There are some things you can do to retrieve the files from that user account though if you need to.
OK, if you are running Windows 7, Microsoft tightened
security on it so you've got to have a password reset disk which 99% of the
people who own laptops with windows 7 fail to do. It should be one of the
first things you do when you buy the laptop. Otherwise, you're faced with
reinstalling the Operating System or possibly doing a System Recovery.
If you're on Windows XP or Vista try this:
Turn off the computer, then hit the power button to turn it back on and
immediately start hitting the F8 key repeatedly until you see the Safe Mode
option. Select SAFE MODE and let the computer boot up. When it gets
to the User Login screen it will show the Administrator userid and the userid
for which you forgot the password. Sign in as the Administrator (hopefully
you didn't put a password on it and forgot it too). Once the desktop
appears it will look different, the screen will be darker and the icons bigger,
but this is normal for safe mode.
Click Start/Control Panel/User Accounts
When the User Accounts screen opens, click on the userid for which you forgot
the password. Select the option to REMOVE PASSWORD.
Reboot your machine.
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