Which (ImageJ, MATLAB, etc.) are you trying to connect to? Are you seeing a specific error code in the Device Manager?

This is often a FireWire controller issue rather than a camera driver issue. In Windows Device Manager, try switching your FireWire (1394) controller driver to the "Legacy" version.

During installation, if prompted for camera models, ensure the V-Series or "All Models" is selected.

Allows third-party software like Image-Pro, MetaMorph, or ImageJ to communicate with the camera.

QImaging Digital Camera V100 Driver: How to Find, Verify, and Install