Dolby Home Theatre v4 not working with windows 8.1

Hello,
I have recently downloaded and updated my laptop to windows 8.1 and suddenly dolby home theatre v4 has stopped working. Battlefield 3 has also begun to crash randomly. Could you please help me?
I have a Lenovo ideapad U410 intel core i5 3337U 1.8GHz Processor, 8GB RAM, 1TB HDD.
thank you
Adam

hi Adam,
Welcome to the Lenovo Forums.
Can you try the following:
1. Uninstall Conexant HD Audio and Dolby Advanced Audio v2 (if applicable) under the Control Panel > Programs
2. Reboot the PC and re-install the Conexant Audio Driver for Windows 8.1 (this contains the sound driver+dolby)
Conexant Audio Driver   
      Windows 8.1  (32-bit, 64-bit)
      Version 8.65.3.53
After installing, reboot the PC and observe.
As for Battlefield 3, have you tried running the game in compatibility mode? If you're getting Direct-X errors, check this thread.
Regards
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