I appreciate you trying the steps provided by my colleague above, @bethlloyd01.

Do you mean you can still see three companies from the No Company Open window? If so, you can remove the unused companies by clicking the Edit List button. This way, the company will be hidden but not deleted. Make sure to leave the Company you are currently working for.

For future reference, you can read this article for guidance about backing up and restoring backups in QuickBooks: Restore a backup of your company file.

Let me know if you need additional assistance in accessing your QuickBooks files. I'm always here to help. Have a great day.