Reset non-administrator account passwords

Here is another simple way through which you can reset the password of any non-administrator accounts. The only requirement for this is that you need to have administrator privileges. Here is a step-by-step instruction to accomplish this task.
1. Open the command prompt (Start->Run->type cmd->Enter)
2. Now type net user and hit Enter
3. Now the system will show you a list of user accounts on the computer. Say for example you need to reset the password of the account by name Joker, then do as follows
4. Type net user Joker * and hit Enter. Now the system will ask you to enter the new password for the account. That’s it. Now you’ve successfully reset the password for John without knowing his old password.
So in this way you can reset the password of any Windows account at times when you forget it so that you need not re-install your OS for any reason.
There are also some other tools such as PClogin now,Ophcrack ,Backtrack, Offline NT Password & Reg Editor .
They are used when even administrator does not remember his/her password.
Some of these tools are available at free of cost and user need to burn them on cd before he/she can use it.
These are Live Os with Linux based kernal.
After burning simply boot with the cd  and follow the instruction and you are done................................