It is hard to say what could be causing this problem. Was 7.3.78 pre-loaded on the device?
I could only imaging that the install.reg was modified to create a new install location.Hence why the new installation could not locate all the files??
This can be done if you break the TelnetCE.cab and modify the install.reg
Try performing a manual deletion via ASync.
You may find all the Wavelink install files location via the install.reg....\Application\Wavelink\TelnetCE\Install\install.reg
thank you very much. I have exectued the clean boot and blank file on the scanner and re - installed the TelnetCE application. Now it works properly.