Running the QuickBooks tools hub is the best solution if your QuickBooks won’t open, and the tool can be downloaded from Intuit’s website. After downloading and installing it on your computer, you need to choose program problems and then click quick fix my program. After that, you can operate your QuickBooks application trouble-free. If still the issue persists, then again open the QuickBooks tool hub, go to installation issues, and choose QuickBooks Install Diagnostic Tool. After 15 to 20 minutes, the tool fixes the problem in your QuickBooks desktop, and then you can restart your computer and start working on the QB application.
Press and hold the Ctrl key, then double-click the QuickBooks Desktop icon. Important: Don’t release the Ctrl key until you see the “No Company Open” window unless QuickBooks freezes or gives you an error. Select a company file, then choose Open.