Good evening, thank you for your response and advice. Firstly I should have mentioned that my 727 and 737 are FSX-SE versions .
I have followed your instructions plus extra,
Deleted the .dat files ,then switched of all ant-i virus (I run Norton) and downloaded fresh files from Captain Sim.
Installed and activated at each request . Rebooted my system and with bated breath started FSX-SE , loaded my 727 and 737but alas the problem remains .
All animations work and gauges and switches are operational. I have engine sounds and flap sounds but no sound for warnings, switches or crew announcements.
If you can think of anything else then please say so .
The aircraft are totally operational but sound would be so much better.
Again thank you for your advice
Brian.