I would guess that the File Locations have not been amended for all users; Preferably you would want all files to go to the user's home directory, rather than be carried around in the profile or be sent to a generic temporary location.
In Word, this is set in Tools/Options/File Locations.
You could disable Autorecover for all users, but I'd almost guarantee that if you did, they'd want it back again.
This could only be done by amending the Default user and recreating the profiles for existing users, AFAIK.
CE
I hope this helps