No Audio Output Device is installed.

Nov 4, 2012
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Hello everyone,
I have had my Acer Aspire M3910 for nearly a year with Windows 7 64-bit and the speaker logo has suddenly got a red cross next to it and it comes up with, "No Audio Output Device is installed" I have tried uninstalling and reinstalling but it's not working.
Has anyone got an idea of what to do and what driver I need?
Thank you in advance. :confused:

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