I have updated the thread about the required system files for TDS-3: http://www.wilderssecurity.com/showthread.php?t=2906 The changes: 1. I have updated the list of files and their version numbers as they are showed at the moment at the DiamondCS site. That site was last updated on 08/19/2002. So check again whether those files are indeed on your system, and check whether you have the right version. 2. I have added a posting about how you can monitor those files for changes with a feature in TDS-3. So you will see an alert in TDS-3 when for some reason (for example after the installation of a new program) those files are changed. In such a case you have to check yourself whether an older or newer version is installed; when an older version is installed, install again the right version from that list.