I have followed the instructions in the discussion you sent me the link for, but the result is still the same.
After that, I tried to repair sepm via Control Panel. When I select the option Repair, the system "works" for about 20 seconds, then finishes without error message, but also without result: still no content in my reports. Then I selected the option Change. This starts the Installation Wizard. There I can choose Repair or Remove. I have tried both options, but they both produce the same error message: "Error 2755. Server returned unexpected error 1640 attempting to install packagemaker C:\Windows\installer\e785c73a.msi." When I click OK, I see "Fatal error during installation".
Then I tried to rerun setup.exe form the installation package for Symantec Endpoint protection small business edition 12.0.1 AllWin_EN. I select the option Install and that returns the error message "Unable to copy installation file ( \spc.\sav.xml) to the Symantec Protection Center application".
So I get error messages trying to repair AND trying to remove sepm. Any idea what I can try next?