A new installation always brings about some changes to the system registry. If the installation involved creation of a command in the context menu, first uninstall the software. Reboot and check if the command is till exists in the context menu. If this is the case, then some registry entries were probably left during the uninstallation. Create a complete system backup and secure the registry as well, for example using the ERUNT freeware, available on the CHIP DVD or on the website (.tonline.de/eruntl).
Now delete all objects in Explorer that have any relevance to the application. Next, search for the program and manufacturer name in the manual mode of the 'RegCool' registry editor, available on the CHIP DVD. Delete entries you find here-and not anything else! Finally, check whether there is yet another entry of the software hidden under 'HKEY _CLASSES_ROOT\*\shellex\ Context MenuHandlers'. If yes-then delete it.