Clear Password Or User Accounts. Click Permanently Delete Account at the bottom of the page. Choose one of your user accounts and click the Reset Password button.
However if you have no such disk then to reset a Windows password is a very difficult and tricky task. When the Local Users and Groups snap-in opens click Users from the left pane then right-click the Administrator in the center pane. Click one of the entries in the list and expand it you can then click the Remove option to clear it.
On the E-mail address pop-up menu click the account whose password you want to clear.
To delete an individual account. You can use this feature by installing the Credential Provider for Windows VISTA systems. If you clear the Remember my password check box and click Cancel the password is retained and will appear the next time you sign in. Go to the Login screen on your computer and click on the Right-Arrow.