QB unrecoverable error 20037 35794 after Windows update. can't open QB, can't start a chat, HELP.

Which QB Desktop year version and Windows OS do you have?

QB desktop premier non profit 2020  Windows 10.  

QB worked fine yesterday, then windows did an update:(  not QB won't open.

Check your Win 10 version. Is it 1909, 2004, 20H2 or else? 

qb desktop premier non profit.  windows 10.  

2004

Thanks for the additional information, @Novum Baptist,

QuickBooks Desktop 2020 is certified to work properly on version 1803 of Windows 10. The QB 2020 System Requirements also states, that all Windows 10 editions including 64-bit, natively installed should work.

If you're getting an unrecoverable error when launching QuickBooks, try running it again as Admin. Do it by right-clicking the QuickBooks icon in the desktop and selecting Run as Administrator.

If it persists, use the Repair Tool. It fixes most issues with the software. Here's how:

1. Create a back up your company file beforehand to avoid any accidental data loss.
2. Reboot the computer and tap the Windows Start menu.
3. Find Control Panel on the search field or select it from the list.
4. Press Programs and Features then Uninstall a Program.

   Note: If you don't see Programs and Features, select Programs instead. Then select Program and Features.

5. Pick QuickBooks from the list of Programs, then press Uninstall/Change.
6. Click on Continue, or Next. then Repair.
7. Press Next again then wait for the tool to start its diagnosis.
8. Hit Finish when done.

To learn more about repairing QuickBooks and its complete steps, go to this link: Repair your QuickBooks Desktop for Windows.

If the problem progress, please contact our Technical Support Team for further assistance. To get started, use the steps below:

1. Open QuickBooks and click the Help menu.
2. Select QuickBooks Desktop Help.
3. On the pop-up screen select Contact us.
   
4. Click the Search for Something else button then type your concern in the Ask us anything box.
5. Hit Search then scroll down to get your contact options.

Refer to this article to learn more about our contact options and support availability: Contact QuickBooks Desktop support

Let me know the result once you've tried out the steps. I want to make sure your concern is fully addressed and I'm here to provide further assistance. Have a wonderful day!