Thanks for responding.
Unfortunately not.
Strangely I can link photoshop to Tiffs, but not to ARWs. PS doesn't show as a possible program on default or linking choices.Much the same with "open with", PS doesn't show as a choice.
After uninstalling the Acrobat program in programs, the default program switched from acrobat to Windows photo viewer, again with no ability to link to PS either on "open with' or on the "Start" default programs
Many thanks.