Only on one machine do I see this: if while in IE you click on a PDF file,
Acrobat starts to load but takes a long time to do so. Well, couple of
minutes. I know, compared to the age of the earth...

I've tried uninstalling and reinstalling Acrobat 6.0 professionals; no more
updates; cleared out caches etc.

Any advice would be greatly appreciated.

Regard,
John