Many thanks Zammy-Sam
Tried suggestions but makes no difference still freezes solid. I have even tried switching off all other applications and even that makes no difference!! Doomed I think!
About giving up on trying to find a solution to Acrobat freezing OSX. I am running Acrobat 6.0 Professional and also Acrobat Reader 7.0 on OS 10.3.7 on a G5. Acrobat seems to be having problems opening PDF files whether supplied from various external sources or created by me from within Quark...