When you start QuickBooks Desktop, it is already running and starts instantly. When QuickBooks Desktop is running in the background, it's identified as a process (QBW32.exe) in the Windows task manager. If this causes unexpected computer problems, you can turn off this preference.
Solution 1. End the QuickBooks Desktop processes running in the background
Solution 2. Turn off "Keep QuickBooks running for quick startups"
NOTE: After you close QuickBooks or restart your computer, QuickBooks should no longer run in the background.