Hi Pete8475, You are correct, I've installed it and now I can view pdf files on-line with Adobe Reader - and it displays the page quickly unlike Chrome Reader which spends an interminable amount of time loading. Thanks for pointing me in the right direction.
To anyone reading this and wanting to install Adobe Reader; BE CAREFUL: It'll try and install Google Chrome and make it your default browser so make sure you untick that option.
Thanks to everyone who offered suggestions. What threw me was when I checked for updates on Adobe 10 - it said there were none available. (???).