Stan,
Yes it was at root of the C-drive and was called "AdobeTmp" exactly like that. Possibly it was introduced by the reseller? I'm only guessing.
Meanwhile, I have moved it off to another drive to find out whether anything "misses" it...
I won't know for a while because my system is fully engaged doing other things at the moment.
I did google it earlier, but nothing relevant to Encore. Just now I tried again and google found nothing but bing did, albeit a different adobe product and in a different location: http://answers.microsoft.com/en-us/windows/forum/windows_vista-windows _programs/adobe-reader-keep-getting-message-appdata-failure/e4dc2e9c-b b05-466a-83b1-6deedd3c9030 . So it sounds like an Adobe convetiional folder name. Maybe it became dislocated due to some install or update glitch?
David