I can help you with resolving the error you're having when launching QuickBooks Desktop 2022 and recover your missing customers and vendors, @swimgirl.

Let's check your setup so you can access your company files that contain your missing vendors and customers. 

The folder permissions and the QuickBooks Database Server Manager on the server computer or the computer that hosts your company files must have the right Windows permissions.

Check this article for detailed guidance on how to set up QuickBooks Desktop on a network to access your company files: Install QuickBooks Desktop on a server.

It'll guide you further on how to scan the folder that holds the company files, then turn on hosting, so your workstation can access the files. 

In case you'll encounter errors opening your company file, missing or blank customer, vendor, or employee lists, refer to this article on how to resolve it: Fix company file and network issues with QuickBooks File Doctor. 

I'm always here if you need more help opening your company files or resolving missing customers and vendors. Let me know by leaving a reply below. Have a great rest of the day!