Detecting Webcam Model How Can I Make My Webcam Work In Windows Vista?

How can I make my webcam work in Windows Vista? - detecting webcam model

My two webcams on Windows XP, but now I'm on Vista, does not work. It is A4 Tech PK-635m and the other is a generic model of the webcam VC17U. I downloaded the updated official driver for Windows Vista and was able to install successfully. But if I use the webcam, said there is no recording device is a webcam is not recognized? What should I do now? Please help me with this. Thank you! :)