QuickBooks Database Manager is a service that allows multiple QuickBooks users to access the company file in the network at the same time. When the service is disabled or damaged QuickBooks might give you an error QBDBMGRN Not Running on This Computer. In this article we will discuss the reasons and troubleshooting steps to resolve the error so make sure to follow the entire article until the end for detailed information. You can also call QuickBooks Helpline Number (855)-550-4333 if you want us to walk you through the troubleshooting steps.