Vista and Windows 7 8 10 do not allow writing files to the Program Files directory, so instead of installing Ditel on C:Program Files (x86)Ditel_Prospect put the program directly on the root of the C:Ditel_Prospect disk at the time of installation by removing the Program Files (x86) label.
The Norton antivirus prohibits, in a completely unjustified way, the installation and the use of Ditel. Please replace it with "Microsoft Security Essential" (free for less than 20 workstations).
Microsoft is the only one to have a real interest in the disappearance of viruses and to have a global vision of the Windows world, an essential condition for eradicating viruses.