My Acer Crystal Eye webcam is working fine, it takes pictures, videos but when I take videos, I play it back and I start talking and I can't hear my voice until after about 5 seconds so it's not synced my video.
Use the Acer Support and locate the drivers for your product then download a new version of the application. The software is bundled with the camera driver. Alternatively, make sure that you have the latest DirectX installed. There could be a problem with the DirectX sound files.