How to Reset a Forgotten Password in Windows.

1st Method:

The first thing which you check if you forget log in password. When we install Windows, it automatically creates an account “Administrator” and sets its password to blank. So if you have forget Your user account password then try this:
Start system and when you See Windows Welcome screen / Login screen,

press ctrl+alt+del keys Twice and it’ll show Classic Login box.

Now type “Administrator” (without quotes) in Username and leave Password field blank.

Now press Enter and you should be able to log in Windows.
Now you can reset your account password from “Control Panel -> User Accounts”.

Same thing can be done using Safe Mode.
In Safe Mode Windows will show this in-built Administrator account in Login screen.

2nd Method:

At the logon screen, press Shift+F10 to open a Command Prompt with adminisrative priviledges and type:
net user {username} {password}

{username} = The Account’s User Name
{password} = This will be the new password

After done, you can log in your account with new password.

3rd Method:

If the above mentioned tricks don’t work, then try following trick which is actually a loophole in Windows XP Setup and a big security hole, This one is mostly for the experience user, so do with care:

A. Boot using Windows XP Setup CD and follow the instruction like Accepting EULA, etc.

B. When it asks to repair your existing Windows installation, accept it and press “R” to run the repair.

C. Setup will start repairing your Windows and will start copying files, etc.

D. After a few minutes setup will restart your system and when it restarts don’t press any key when it shows “Press any key to continue…” otherwise Setup will start from the beginning. Don’t press any key and setup will resume where it left.

E. Now it’ll start doing other tasks and will show a small progressbar with a few details in left side.

F. Look carefully at the details and when it shows “Installing devices”, press <Shift>+F10 keys in your keyboard.

G. It’ll open a Command Prompt window. Now type nusrmgr.cpl and press <Enter>.

H. It’ll open the same “User Accounts” window which you see in Control Panel.

I. Now you can remove or reset any account password without any problem