Maybe try this, helps me when I need to disable every security center I have, sometimes even though I disable a security program it still blocks things for me. 1. Windows 7: Go to the start menu and type Run, open the application. Windows 8: Hold the windows key (the key between Ctrl and Alt) and hit the R key. 2. Type in "msconfig" without the quotation marks, hit Ok. 3. Go to the tab near the right called "Startup" and for me I have to click another button called "Open Task Manager" 4. Disable all security programs and restart your computer. When you log in they shouldn't open up right away and will have no chance to activate, meaning if it was any of them you should have no problems with downloading the launcher. I personally recommend uninstalling anything that blocks downloads and applications because, for me, it causes more problems than it solves. If you want them reactivated just follow the steps again and enable the applications again and restart your computer, hope this helps. This also worked for me when I had a virus that would redirect every search engine :P