Could you check if the file window_icon.png is in the folder "Influencing-0.1.15.0-pc\game\gui"? If the file does not exists, try to unpack the zip file again. If the problem persists, please tell me again.
If the file exists, I suggest you to check your windows. Sometimes windows updates does something wrong with some important dll of the system and it stops to read renpy correctly (beside other executables, of course).