To disable the operation did not completed unsuccessfully because the file contains a computer virus, you must turn off Windows Defender. If you are absolutely certain that the file you downloaded from the Internet is free of viruses, you can try to run the program anyway, even though it warns you that the "operation did not complete successfully because of a problem." If you want to make sure that the program runs properly, you'll have to turn off Windows Defender and open it while it's disabled. You might see a message saying that the application cannot start due to some errors.