Hi there, Maggie1964.

I appreciate you sharing more details about what you've experienced. I've got the steps you can perform to fix the issue. 

Since this is affecting your machine, there's a possibility that your user credentials are damaged. Let's use a different QuickBooks user by opening your company file. 

To do this, you'll simply set up a new user. Here's how:

1. Go to Company, choose Set Up Users and Passwords, then select Set Up Users.
2. For Enterprise users: Go to the Company menu, select Users,  then Set Up Users and Roles.
3. Select Add User..., type the username and password then select Next. Please don't use the damaged user name.
4. Customize the user as necessary, then click Finish.
5. Go to File, then select Close Company/Logoff.
6. Log in to the company file using the new login credential.

If the new user works, then delete the user you're having problems with and create it again. If the new user doesn’t fix this, you can create a new Windows Admin.

For Windows 10 and newer:

1. Click Start, then select Settings.
2. Select Account, then Family & other users.
3. Under Other Users, select Add someone else to this PC.
4. Click I don't have this person's sign-in information, then Add a user without a Microsoft account.
5. Enter the name of the new account, then Finish.
6. It's recommended to assign a password to the new account to ensure security.
7. Select the newly created account, then choose Account Type.
8. Choose Administrator, then OK.

For Windows Server 2012 and newer:

Please consult your IT professional before following the steps in this section.

1. Open Server Manager.
2. Select Tools then select Computer Management.
3. Expand Local Users and Groups, then select Groups.
4. Double-click the Administrator Groups to open the Administrator Properties window.
5. Click Add.
6. From the Select Users, Computers, Service Accounts, or Groups window, enter the account you want to add to the local admin groups. 
7. Click OK.

After you set up the new admin log out and back into Windows, then open QuickBooks. If you don't see the error then your original Windows user either doesn't have enough access or is damaged. You'll need to reach out to your IT person to get help repairing or replacing your Windows user.

If none of the steps above works, I'll let you contact our QuickBooks Desktop Team. I know you've already contacted them. However, they can review your recent case and create a case and forward it t our Product Team for further investigation.

I'm leaving this article for other troubleshooting solutions you can try: Fix data damage on your QuickBooks Desktop company file.

Let me know how the contact goes by commenting below. I'll be right here whenever you have additional questions.