Hi, This is a particularly stubborn issue, and the fact that it persists even after restoring from a backup is a critical clue. It indicates the problem is likely not a simple file corruption, but rather a deeper issue with the user profile template or a system-wide component that the backup also contained.
The core of the problem lies in the difference between "old" user profiles (which work) and "new" user profiles (which don't). New profiles are created based on the Default User Profile. If this template is corrupted, all new users will inherit the same problem.
Here is a structured diagnostic and repair plan. Please follow these steps in order.
Step 1: Rule Out Profile-Specific Corruption First, let's test if the issue is truly universal for all new users or if it's specific to how they are created.
Create a brand new local user account and add it to the Administrators group.
Log out completely and log in with this new administrator account.
Test the Start Button:
If it works, the issue is likely with specific user group policies or permissions applied to your standard users.
If it does not work, this confirms a system-level corruption, and we proceed to Step 2.
Step 2: Rebuild the Corrupted Default User Profile Since old profiles work, we can use a working profile to rebuild the broken default template.
Log in with one of the "old" user accounts where the Start Menu works correctly.
Open File Explorer and navigate to C:\Users. You should see the folders for the old users and a Default folder.
Go to Control Panel > System and Security > System > Advanced system settings (on the left).
In the User Profiles section, click the Settings... button.
You will see a list of profiles stored on the computer. Select the profile of the "old" user that is working correctly.
Click Copy To....
In the "Copy profile to" field, type C:\Users\Default.
Click the Change... button under "Permitted to use," type Everyone, and click OK.
Click OK to start the copy. You will be prompted to overwrite the existing Default folder; confirm yes.
Restart the server.
Step 3: Investigate System-Wide Components If the previous step fails, the corruption is deeper. We need to check core system components.
Run System File Checker & DISM:
Open an Administrative Command Prompt.
Run the following commands, waiting for each to complete:
cmd dism /online /cleanup-image /restorehealth sfc /scannow These commands will check and repair corrupted protected system files.
Check for Rogue Policies with Procmon:
Download Process Monitor from Microsoft Sysinternals.
Reproduce the issue by logging in as a new user.
In Procmon, look for "ACCESS DENIED" results when StartMenuExperienceHost.exe or ShellExperienceHost.exe are trying to access files or registry keys. This can pinpoint a specific permission block that group policy might be enforcing.
Step 4: The Nuclear Option (if all else fails) If the above steps do not resolve the issue, the most reliable path is to create a new, clean Windows Server 2019 VM in Azure and migrate your roles and services. Given the time already invested, this may ultimately be faster and provide a more stable foundation.
The persistence of this issue across a backup restore is highly unusual and suggests a deep-seated corruption. The "Copy Profile" method in Step 2 has the highest success rate for this specific symptom.
I hope this structured approach helps you resolve this challenging issue.
If this guidance was helpful in diagnosing or resolving the problem, please feel free to mark it as "Accept Answer" 😊.
Best regards, VP