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Okay, which operating system is on your computer ? Windows Xp, Vista, 7, 8 or 10 ?
Press Windows Logo key and R key on your keyboard together.
You will get open the Run command box
Type sysdm.cpl in the Run box and press Enter.
You will get open the System Properties window
Make sure Computer Name tab is selected
Click on Change button
Put the name there and click on OK then Apply and then OK
Did you tried it ?
What you mean by it didn't work, can you please explain the problem ?