This article will tell you how to recover you PC login password and do not need to know current password.
Recover computer password for Linux

If lose the root account password of Linux, follow the steps below to recover it.
- When computer power on, press any key to enter Boot Menu.
- Choose a kernel you want to load, and then press e key.
- Choose the line the kernel on, and then press e key.
- Type single to the end of the line - …rugh quiet, and the press Enter key.
- Press b key to restart.
- After computer reboot, it will enter single mode.
- Use passwd command to reset the password. Type password, press Enter, and then input new password.
- Reboot computer, and you computer password has been reset, so you can login with new password.
Recover PC password for Windows 2000/xp/2003/vista/7/2008

Solution 1: Reset windows password with windows password reset disk
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1.
If you enter the wrong password when you
attempt to log on, Windows displays a message that the password is incorrect.
Click OK to close the message.
2.
Click Reset password, and then insert your
windows password reset disk (or other removable media).
3.
Follow the steps in the Password Reset Wizard
to create a new password.
4.
Log on with the new password. If you forget
your password again, you can use the same password reset disk. You don't need
to make a new one.
Solution 2: Recover windows password with Windows Password Reset Tool
Here I show you main tips to reset or recover your computer password
with Spower Windows Password Reset Tool. Spower Windows Password Reset
Tool can reset Windows 2000/xp/2003/vista/7/2008 local password and Active Directory(domain) administrator password.
- Get Spower Windows Password Reset.
- Create a CD/DVD or USB bootable disk with Spower Windows Password Reset.
- Boot computer from Windows Password Reset bootable disk.
- Reset local password or domain admin password.
- Restart computer and login with new password.
For more detail, see Windows Password Reset site.
Recover Mac computer password

- Insert Install disc to Mac computer, restart computer, and then press down c key to make computer boot from Install disc.
- Select a language, and continue.
- Choose Password Reset from the Utilities menu, or choose Password Reset from Installer menu.
- Select your Mac OS X hard disk volume.
- Select the user name of original administrator account.
- Input new password.Screenshot as below.
- Click Save to save change.
- Click the red button in the upper left corner to quit the application.
- Choose Quit Mac OS X Installer... from the Mac OS X Installer menu.
- Click Restart. And then you can login Mac with new password.
