Put your controller into pairing mode (e.g., holding or Home + V3 depending on your hardware). Connect the controller to your PC via Bluetooth or USB.
Qxstartserverv3.0.0.5.exe is an executable file that appears to be part of a software application or a server management tool. The name suggests that it's related to starting or launching a server, possibly for a specific application or service. Qxstartserverv3.0.0.5.exe