Hello everyone. I understand you have lost audio capabilities when updating to Windows 8.1. Unfortunately, there are no Windows 8.1 drivers available for this product, as indicated here: http://h10025.www1.hp.com/ewfrf/wc/softwareCategory?product=5399986&lc=en&cc=us&dlc=en&lang=en&cc=us
For information and suggestions, please reference this document, explaining what you can do when an operating system is not supported (by a specific product): http://h10025.www1.hp.com/ewfrf/wc/document?docname=c03791820&lc=en&cc=us&dlc=en
Let me know if you have any other questions or concerns.
Mario