Whenever you get “QuickBooks has stopped working”, or “QuickBooks is not opening” error it is typically due to one of the following reasons: Windows operating system files are damaged. There are damaged or corrupt sectors on your hard disk. QB Desktop installation files are damaged. Steps you can follow to restart Quickbooks: 1. If you haven't already, back up your company file. 2. Restart your computer. 3. Open the Windows Start menu, then select Control Panel. 4. Select Programs and Features then Uninstall a Program. 5. Select QuickBooks from the list of Programs, then Uninstall/Change. 6. Select Continue, or Next.