To resolve the “QBCFMonitorService Not Running On This Computer” error in QuickBooks, first try starting the QBCFMonitorService manually by opening the Services window (press Win + R, type services.msc, and press Enter), locating the service, and selecting “Start.” Ensure it’s set to start automatically by adjusting its properties. Next, check for QuickBooks updates under “Help” > “Update QuickBooks Desktop” and install any available updates. If the issue persists, repair your QuickBooks installation through “Control Panel” > “Programs and Features,” or try restarting your computer to apply changes. Additionally, verify that no other programs or security software are interfering with QuickBooks. If needed, uninstall and reinstall QuickBooks to resolve deeper issues, or contact QuickBooks Support for further assistance.