How to Change a PC's ID Number
Windows computers have an identification number or name, which is set when the computer is new. The ID can be numbers, letters or a combination of these characters. If your computer is on a network, other users may see this name. You can customize this computer ID for clarification or if you simply want a change. Windows enables you to quickly modify the computer identification name from the System Properties dialog box.
Open the Charms bar.
Choose "Settings," and then select "Control Panel" and click "System."
Locate the section marked "Computer name, domain and workgroup settings." Click "Change Settings" to open the System Properties window.
Select the tab marked "Computer Name," and then click "Change." Delete the existing name or number and enter a new identification.
Select "OK" and "OK" a second time. Exit the System dialog window.