We have to open the Registry Editor for this purpose… Click on Start Button and type “regedit” or “regedit.exe” under the “Run” option to open Registry Editor program. You may also get it by making a search for “regedit.exe”.
It is actually in the drive having Windows (which is generally C:), placed as C:\Windows\regedit.exe, which would be easiest to find.
Once the program is open, navigate through this route:
Then double-click on “Default” placed on the right side of the editor. In the “Value Data” field enter the desired name you wish to give, for e.g. “Phoenix”. Confirm the entry and close the editor. (You may have to restart the computer to see the changed name.) Enjoy the results :-).
(Note that this change is applicable only for the currently logged on user. If you wish to rename the “My Computer” for other users as well, you must log in from the relevant user account and go through the same process to change the name.)