Thanks Geoff, I rang Adobe this morning, they told me to download a 'clean-up' script and run it. It cleans out all and any old Adobe
detritus that's been left behind by older bits of their software which in my case was an attempt to run PS 7.0 on Leopard which failed, an old version of PSE 4 and then of course the trial version of 6. They told me to run the script two or three ...