Some versions of Linux can run the Windows Secure Boot just fine if installed as UEFI. I have been running Windows 7 as UEFI since 2010.
The Intel Display audio looks a little strange to me. Are you running the audio through an HDMI cable?
If you have any files named setupact.log you might go through them to see if any errors show up. There may be more than one version, so try to find one which was active during the upgrade/rollback. Hopefully it wasn't removed during the rollback. If you have a Windows\Panther folder it may be there.
Running multiple OSes on a system may be involved in your problems. That is why always set up my OSes on separate Hard drives so I can disconnect them during such operations.