In answer to lomapaseo, I received the powerpoint file as an attachment to an e-mail, and just tried to pass it on to a couple of other friends - but I now realise that I omitted one vital piece of info. - I don't have PowerPoint installed on my computer, only PowerPoint Viewer 2007 which won't even open a PowerPoint attachment directly viz. .... " don't have associated programme installed, go to Set Associations etc. etc." which I've never overcome so I have to Save to Documents, and then the PowerPoint viewer allows me to open them.
I guess I'm stuffed, and as it was only really friendly chatter for me anyway, I'm not going to get too excited. I do have access to another computer, which I think has the Libre Office Powerpoint link installed, so I may give that a go when I get a chance.
Thanks again.