The name of the computer can be changed on a Windows 7 PC using the System Properties window.
To access System Properties window you can follow any one of the steps mentioned below
1. Start Menu –> Computer –> Right Click and select Properties –> Advanced System Settings
2. Star Menu –> Control Panel –> Systems and Security –> System –> Advanced System Settings
In the System Properties select Computer Name tab
Click on Change button, this would launch the Computer Name/Domain Changes window
Enter the new Computer name in text box available below Computer name: label and Click OK to confirm the changes. Make sure to restart your PC for the changes to get effected.