If you are unable to increase the volume in Windows, you may need to reinstall the audio drivers from the official website of the hardware maker but before doing so, review my tips on fixing audio volume issues.
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About The Author: Stephan Pringle is an Information Technology Support Specialist. He covers hardware and software and provides tips for you to troubleshoot and repair issues on your own. In his spare time, he writes articles about the State of New York on his Hackintosh and HackBook and that has helped him to become the top contributor of the New York City section of Yahoo! Answers.