WinPasswd is a good to use free tool for all those network administrators and those people who either have a small windows network of computers in their home or office networks. It allows you to change the password of any windows machine on your network, just enter the name or IP address of the windows machine.
Click on the add button to add windows machines on your network for which you want to change the password.
After adding the servers or windows machine on your network click change to Change button the password over one machine or click Change All button to change the password of all the servers added.
Note: You can run this utility from any of the network computer.