Recently everytime i boot up, command prompt appears for about half a second then kills itself. Afterwards this site call gameharbor.org shows up on my browser (Google Chrome). I have tried everything to remove this .... i have tried malwarebytes, Avast , adwcleaner but nothing seems to have worked. I have no idea where this problem came from and i have avast running 24/7 on my machine. If anyone knows how to fix this please help.