How to Change Window 7 Password without Knowing Current Password

• Go to Control Panel and click on the Administrative Tools.
• Under this section double click on Computer Management.
• Select  System Tools from right window pane.
• Under this, just double click on Local Users and Groups and then on Users
• Now you will see all the login accounts of your computer. Right click on any the account whose password you want to change and then click on Set Password.
• A warning message will popup on your screen just click on Proceed button.
• Now enter your New Password  and click on OK button.

That’s it! your windows 7 password is changed without knowing current password. The only limitation of this method is that your current  account should  have Administrative privileges.