First go to the device manager and check the "Imaging Device > Acer Web Cam" is available without any error. If not available, it may be a hardware issue. If available , try to uninstall webcam application and reinstall it. Please give me the feedback. Hope this will help you.
Acer is proud to announce the promotion of Philetus to the ACE team. Philetus has been a member since March 2013 and has shown the skills and patience required to be a member of this exclusive, invite only team of experts. Congratulations Philetus!