Windows 11 How do I change my "Full Computer Name" ...

To change the "Full Computer Name" in Windows 11, which is currently set as T580.T580, you can follow these steps:

Steps to Change Full Computer Name​

1. Open System Properties:
   • Right-click on the Start button and select System.
   • Alternatively, you can access it by pressing Windows + Pause/Break keys.
2. Go to Advanced System Settings:
   • In the System window, look for "Advanced system settings" on the left side and click on it.
3. Computer Name Tab:
   • In the System Properties window, click on the Computer Name tab.
   • Here, you will see options related to your computer's name and domain.
4. Change Settings:
   • Click on the Change... button near the bottom of the window.
5. Modify the Full Computer Name:
   • In the dialog box that opens, you can change the Computer name.
   • Make sure to change the computer name so that it does not form a double entry. For instance, if your current Computer name is T580, try removing the domain part that causes the duplication.
6. Reboot:
   • After making changes, you’ll need to restart your computer for them to take effect.

Additional Considerations​

• The "Full Computer Name" typically reflects both the computer name and the domain it belongs to (if applicable). If your computer is not part of a domain, this means that Windows is appending the machine name to itself.
• Ensure that the computer name changes adhere to naming conventions (no spaces, special characters, etc.).

Visual Reference​

From your attached image, I can see the current settings:

• Computer Name: T580
• Full Computer Name: T580.T580
• Description: T580

By following the above steps, you should be able to resolve the redundancy in the full computer name. If you continue to have issues, feel free to ask for more tailored assistance!

@ ChatPGT,
This is exactly what I have done, over and over again.
Removing T580 from the "Computer name" results in an empty "Computer full name", but when I reenter T580 in "Computer name" the result shows up as T580.T580 in "Computer full name".
I'm not using any domains, but only Workgroup for my LAN.

Btw.: I have searced "Regedit" for the string "T580.T580", but to no avail.

Ok.... there it was.
Point 5 - Edit the Registry (It should have been the first point of the list (IMO)).
I have removed T580 in both Domain og NV Domain, and all is now as expected.

Great job on resolving the issue with the "Full Computer Name" by editing the registry! Here’s a summary of your journey and the final outcome:

Summary of the Solution​

• Initial Problem: The "Full Computer Name" displayed as T580.T580, which was confusing and unwanted.
• Steps Taken:

• You followed the typical procedures for changing the computer name but faced challenges with the automation of appending the computer name to itself.
• After exploring different methods without success, you discovered that editing the registry was the solution.
  • Registry Edit: By removing references to T580 in both the Domain and NV Domain entries in the registry, you were able to reset it to a clean state.

Visual Insights​

From your attached images:

1. Before Editing: Showed the erroneous entry with T580.T580.
2. After Editing: Confirmed that the entry was corrected, and everything now appears as you expected.

Final Thoughts​

Your experience illustrates the importance of checking the registry for persistent naming issues, especially in cases where standard settings do not yield the expected results. If anyone else encounters similar issues, it might be wise to consider registry settings early in the troubleshooting process.
If you have further questions or run into new issues, feel free to ask! Your persistence in resolving the issue is commendable, and I’m here to assist whenever you need.