You cannot log on because the logon method you are using is not allowed on this computer. Please see your network administrator foe more information.

I have tried these steps below but not working. I sincerely need your help, most people in my office couldn't work today because they couldn't log in to their systems.

Run gpedit.msc.
2. Expand Computer Configuration\Windows Settings\Security Settings\Local Policies
3. Click on User Rights Assignment
4. Ensure that "Allow log on locally" includes Administrators, Backup
Operators, Domain Users or Users.

Thank you.