I lost my dolby driver after Windows 10 upgrade

I own a s7-391. I just updated to windows 10. I lost my dolby driver. For some reason my laptop doesnt sound as loud as it once did. Could be this be the issue?
[subject line edited to reflect new topic]

I'm facing the same problem too. I'm using Aspire V5-573PG. After upgrade to windows 10, the dolby home theater v4 stop working. I tried to uninstall the old driver and download the driver for windows 10. But no help at all, the dolby home theater v4 software wasn't in my computer. Hope they will patch the software ASAP.P.S: The proble probably came from cortana. The dolby software auto turn off when I use google now on google chrome last time, but it can be turn on again, but not this time...

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