Edit: The message is that the Adryn%20dialer%20switcher-windows.cab was successfully installed on your device.
The program you have installed may not display properly because it was designed for a previous version of Windows Mobile software. When I went into My Storage and tried to install it, the message said that the previous dialer must be removed first. When I clicked OK, the message said that it could not be removed. What do you think that means? Interesting problem.