Please uninstall Translation Office 3000 from your computer, locate the folder 
"C:\Users\Public\Documents\AIT\TO3000, Version 3D\db" (if it exists) and move it to a different location.

After that, please delete the folders

C:\Users\Public\Documents\AIT\TO3000, Version 3D\
%HOMEPATH%\AppData\Local\AIT\TO3000, Version 3D\

Then, please get the latest version of Translation Office 3000 3D here:
http://www.translator3000.com/downloads/SetupTO3000v3D.exe
or
http://to3000.com/download3/SetupTO3000v3D.exe

and install it with the Demo database.

If the problem persists, please send us the installation logs; they should be saved in 
%HOMEPATH%\AppData\Local\AIT\TO3000, Version 3D\Logs"