Lost Sound in Acer Extensa Windows Vista

Sami Sir, that was a comprehensive reply to my request for help.
Thank you. Already downloaded a sound driver from Acer, as guided by Dominic of your team. Installed it and was told it is ''ready for use''.
However, another window lurked behind it that said, ''Windows Driver Foundation -- User Mode Driver Framework Host Process stopped working and was closed''.
From this i guessed my pc cannot take on any sound installation.
Therefore, hit upon the idea of going to Factory Default and working my way through and also learning a new experience, on the way.
Nevertheless, Dominic has graciously offered to help me and am prepared to accept his offer 'at my own risk'.
If all goes well, 'Thank ye God' and if something goes wrong, it is again 'Thank ye God, for the new lesson'.
Thanks and Cheers, Sir, you are indeed worthy of your position.