So you must try to repair your QB 2019 first. Go to Control Panel > Program & Feature. Find Qb 2019 and repair it. Windows will quick reinstall it and may fix something.

If the problem still persists, do a clean install.

https://quickbooks.intuit.com/learn-support/en-ca/troubleshooting/clean-install-quickbooks-desktop/0...

Hope it helps.