After download and trying so many software and driver for Acer Aspire 4738Z Windows 7 webcam. At last we find the solutions.
- Go to Acer website and choose download sections.
- Don't choose Acer Aspire 4738Z but choose Acer Aspire 4739Z.
- Pick your prefered version of Windows 7 and choose 'Application' tab.
- Download Camera Cyberlink Webcam Application version 1.0.1424.
- After finish download, install as usual and restart your windows.
Walla! Now you can use your camera.
If you have any problem please mention it on the comment below.