Please Install The Webcam Driver Using PK-335 A4tech Webcam Cannot Install Using Driver From Websiste...help!?

PK-335 a4tech webcam cannot install using driver from websiste...help!? - please install the webcam driver using

I had my PC recently, but I lost the driver CD-A4Tech Webcam MX-335. I downloaded the driver from the website, but I can not properly installed ... Windows can recognize the webcam and it shows, however, is still said to w / error in Device Manager and when I try to open it, no camera is installed or found. Please help