My computer too. I got mineshafter, and then downloaded the launcher, but then, it said that the launcher was harmful to my computer. And every time I open the launcher, (I have to re-download every time, minecraft doesn't stay open after I click quit), it asks if I want it to make changes to my computer. Its really annoying, and I just went around and fixed all the problems, and I don't want to have to do it again. I think that the launcher is bundled with a bunch of other viruses. I want to play minecraft, but I don't want all of the problems. Does anyone know how to fix it??