I am using ZA free under Vista. I have tried everything this site and a dozen others have suggested. The only thing that has worked for me when truevector under version 8.0.298.0 fails (every time) is to go back and install version 8.0.65.0. I do wish they would post the version number for updated before I download them, as I have downloaded 8.0.298.0 4 time now.