Detect My Webcam Won't Detect Webcam??

Won't detect webcam?? - detect my webcam

1) My computer does not recognize, even though my camera is plugged in and it says "webcam found"

Install 2) to my camera (I have the CD so it was downloaded from the Logitech Web site) stops at the "Camera Driver" and restart the elimination of all.

3) You still have all my equipment for a program that can open, but if I for example, you can not find the quick detection even if the camera is connected

pls help!