The administrator code cannot be activated after installing a new operating system on the computer

I installed a new operating system on my computer, installed Team Speak from the official website, but when I try to enter the code for administrator access, a message appears that the code is entered once.That is, before installing the operating system, I activated administrator access, but after installation I can no longer do this.What should I do in this situation?

2 posts were merged into an existing topic: I accidentally removed my server admin