Thank you so much for all your help -
falvallee
re right click on MY COMPUTER then
properties - hardware - device manager -
I looked and there was yellow question mark
and next to it was a section labelled
Other Devices then 2 expandable sections
called unknown device.
When I go to listen and watch a TV programme
on line - I found out since posting initial
query - chrome and firefox is for some reason
resulting in no sound. Yet when l listen to
same site on line with IE I get sound.
I removed Realtek High Definition Audio Driver
and re booted, then re installed it from the link you posted.
Sound works good with IE.
For the time being, I have removed Chrome and Firefox until I know
the reason for it not producing sound.
Thank you JennyJackson01 for your suggestion I found the driver in the Acer site - just hadn't located the drivers sub section when I last looked
