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You can reinstall the sound drivers from the Acer recovery management, to do so: Start Menu> All Programs> Acer erecovery management> Restore> Restore Application & Drivers> Contents> Select Acer Crystal Eye Web Cam and install it
Got to http://gd.panam.acer.com/home/ Select the computer model Select Operating System installed on your computer Click Drivers Select WebCam (Acer Crystal Eye) and download it. Once downloaded, install it on your computer.
Please download the Amcap.zip from http://www.download25.com/install/amcap.html. and Unzip it. Run the setup.exe. It will create "Amcap" in programs. click the Amcap to start the webcam.
Note: You need to install the crystal eye webcam drivers.
If you go to your start menu, look for a programme called 'acer crystal eye webcam' and that will bring up your webcam programme.
It is not in the folder 'Acer crystal eye webcam' though, just 'Crystal eye webcam'.
I had the same problem with the Extensa 5420-5687 as well, I went to the device manager and found my crystal eye webcam (there was a yellow exclaimation point on it) I tried to update the driver software by having it search automatically for the software, but it just said that it was up to date...that still didnt fix my problem. So i tried browsing my computer for the driver. I picked "let me pick from a list of drivers on my computer" I then clicked on "Acer crystal eye webcam" then i hit next, it then installed the updated driver. After that my webcam worked again!