go to device manager, check under imaging device.
check the manufacturer (it should not "microsoft").
download camera application from www.acerpanam.com
if the manufacturer is microsoft, go to www.acerpanam.com
and download all camera drivers (there are 3. bison, suyin and logitech). install the camera drivers first and then the camera application.
Note: if your camera is bison, in the windows directory, there is a folder called "bison" something. so you can download the camera application for bison.