Looks like Tabcmd may not be installed properly. Did you follow the steps outlined in this article: Install tabcmd? If it is installed, is Tabcmd really in the root of H:\? If the directions in the attached document were followed, it was likely installed to H:\tabcmd folder, not at the root. If you want to be able to call Tabcmd from the root, you'll likely need to look into editing the Windows PATH variable manually: Google