The temp folder in the Users/UserName/AppData/Temp/(resource file). The thing is the driver installer will not do anything else, nor does it provide an option to re designate where it puts that installation source. The error message reads: "Setup could not find a file on the specified path or disk", although it appears to be there, that is why I thought it was a permissions problem. The scanner driver does not show up in the Programs Install Control panel so I cannot uniinstall it that way either. Then after I close that dialog it says: "Error -1612 The installation source for this product is not available. Verify that the source exists and that you can access it." The device manager only leads to the same uninstall/install wizard, so that does not help. While this happened after I updated Windows 7, in fact the installer is buggy for not allowing a different destination, but so far I am stumped what to, except a clean install I am not thrilled about. Also I tried to delete the Temp folder, but it has a lock icon on it and I cannot make any changes to it because the Explorer.exe uses it, and so it always says it cannot be deleted, nor can I change the security/permissions and remove the little lock icon. I was able to delete all but one file (unrelated I think) inside the Temp folder, but not the folder itself nor change permissions.
I would throw away all the scanner related files I could find, but I cannot identify them and besides I do not think it would address the core problem that the driver installer will not install elsewhere besides that temp folder, nor will it allow specifying a different search path if I was able to copy it, which so far I could not. I copied the entire Temp folder to the desktop, only to discover that install file was gone.