Many thanks larry39....it is actually Piriform I always use.
However, for some weird reason on THIS occasion it wouldn't play ball...until I got cross and deleted all versions- did a restart and downloaded afresh....no problem THEN!! No idea why - but I'll know in future - should the problem recur! Thank goodness my other laptop behaved itself. It's true what they say ---old fogies and new technology don't always mix!
Thanks again from this old fogy!