This message was posted on behalf of Intel Corporation
In regard to your concern. As you confirm that the issue with the speakers it is related directly to the HD audio (HP) speakers, this problem seems to be related to some driver conflict.
In order for you to find the proper drivers for your HP Pavilion dv7 Notebook PC, you can go to the following link:
Also, after a deep research related to this matter, I was able to find some useful information on the HP official site about Operating System Compatibility that will provide you with more details:
Operating System Compatibility
And for further assistance you can also visit:
I am looking forward to heard from you.