windows 10 won’t install Home › Forums › Product Support › windows 10 won’t install This topic has 1 reply, 2 voices, and was last updated 4 years, 4 months ago by Phobos. Viewing 2 posts - 1 through 2 (of 2 total) Author Posts June 4, 2020 at 1:25 am #16794 Michael GoldsmithParticipant I have D/L System Ninja Pro but Windows 10 won’t let me install it and displayed this error msg. Microsoft Defender SmartScreen prevented an unrecognized app from starting. Running this app might put your PC at risk. June 6, 2020 at 1:01 pm #16801 PhobosModerator It’s okay. It’s Microsoft’s policy. Author Posts Viewing 2 posts - 1 through 2 (of 2 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In