So, I installed the Official demo It is beautiful, but I had sound problems. I didn't hear the sound of the dialogs.
I tried everything you wrote about settings,but nothing helped. So, I checked my system , and I found something.
My system.ini file in the Windows folder has changed. I opened it with an editor (Wordpad or so), and now, I will write the difference.
Before installing the demo in the drivers32 section , there was:
msacm.l3acm=C:\WINDOWS\SYSTEM\L3CODECA.ACM
msacm.l3codec=C:\WINDOWS\SYSTEM\l3codecp.acm
After the installing the demo, in the drivers32 section I found this one:
msacm.l3acm=C:\WINDOWS\SYSTEM\l3codecp.acm
And the other line has disappeared!!! So, I changed back to the two lines to the origin version. I restarted my Windows, and now, everything works well.
------ So, you can try this, if you want, but please make a copy of system.ini before do this.