If your webcam still fails after trying all the above, test the hardware itself. Boot a Linux live USB (like Ubuntu). If the camera works there, the issue is entirely driver/Windows-related. If it fails on Linux, the WB918LA module has physically failed, and you will need to replace the webcam ribbon cable or the entire display assembly.
If you are actually looking for the driver itself, this model typically uses the Universal Video Class (UVC) driver Driver Camara Web Hp Oem Wb918la Abm 1 23