If the camera still doesn't work, the hardware may be faulty—common for this model after many years. A new basic 1080p webcam costs very little and will work instantly.
If Windows fails to load it, run Windows Update (optional updates often include legacy camera drivers). Only resort to chipset drivers (Sonix/Empia) if you are using Windows XP or Vista. Quantum Qhm495-b Webcam Driver Download