Markos,

Thanks from your prompt reply.  I went to the forum you suggested. 
1. In the search, I typed "Virus and threat protection" and hit enter.  This brought up the Windows Security window.

2.   From there i went to "Manage settings".
3.  Then to "Add or remove exclusions".
4.  Then "Add an exclusion".  I added "File" Then went to C:\Program Files and added (x86)\Steam\SteamApps\common\FSX\Captain_Sim\767\ace\ACE_767.exe  and C:\Program Files (x86)\Steam\SteamApps\common\FSX\Captain_Sim\767\cs.sound.dll.

After adding those two files, I restarted FSX Steam and loaded the 767 and still have the exact same problems. 

Under C:\Program Files (x86)\Steam\SteamApps\common\FSX\Captain_Sim\767\sound I have the wave files for the sound.  It's just no reacting when I'm pushing the cabin buttons and APU sound in the cockpit.