Hi there, @redrover1947. I've got here a few troubleshooting steps to help you access your QuickBooks Desktop (QBDT) Pro 2019. 

Let's start with running the Quick Fix my Program option from the QuickBooks Tools Hub. This will help resolve common program issues. Here's how:

1. Close your QBDT program.
2. Then, download the most recent version (1.5.0.0) of the QuickBooks Tool Hub. Save the file somewhere you can easily find it.
3. Next, open the file you downloaded (QuickBooksToolHub.exe).
4. Follow the on-screen steps to install and agree to the terms and conditions.
5. When finished, double-click the icon on your Windows desktop to open the tool hub.
6. Then, from the QuickBooks Tools Hub, click Program Problems.
7. Choose Quick Fix my Program.
8. Start QuickBooks Desktop and open your data file.

If the steps above do not work, let's now suppress your QBDT application. This process will help us determine if the issue is with QuickBooks or your data file. Let me guide you how:

1. Double-click the QBDT icon while holding down the Ctrl key.
2. Unless QuickBooks freezes or gives you an error, don't let go of the Ctrl key until you see the "No Company Open" window.
3. Then, select a company file, and click Open.

If the same thing happens, you can proceed to Solution 3 of this article: QuickBooks Desktop doesn't start or won't open. 

However, if the issue persists after performing the troubleshooting steps above, I suggest reaching out to our technical support team. They have specific tools to further help you fix the problem when accessing your QBDT program. You can contact them outside of your QBDT program using this link: Contact QuickBooks Desktop support.

In case you'll need helpful links and guides to assist you in doing QuickBooks tasks, you can visit our QuickBooks Help page. From there, you'll find a number of help articles and even video tutorials based on the QuickBooks feature you've searched. You can also bookmark them in your browser for easy access and use them as your future reference.

Feel free to post here again if you have any other QuickBooks Desktop concerns. I'm always around to help. Have a good one.