Yes I did have an older version installed (maybe at least 1 year older) without any problems. When I first tried the install of the latest version, it failed; I think that it failed trying to uninstall the older version. I then looked at your website and followed the instructions re removing various files. Even though I log on with Admin. privileges, Windows would not let me remove files from the Windows directory; so I was unable to complete the removal of certain files as per your instructions. I am unfamiliar with the Group policy set-up under the current version of Windows and could not find any way to increase my privileges to enable the removal of files from the Windows directory. The incomplete removal of the older version may well be causing the error when trying to install the latest version.