Minecraft Forums

I started playing the Yogscast Complete Pack on the ATLauncher, but after my first session, it deleted all of it's information, and all that was left was the ATLauncher that will not run. I also noticed that all my other versions of the minecraft launcher stopped workin also. TechnicLauncher, even the vanilla Minecraft launcher stopped working. I have tried running as an administrator, but it just asks for permission to change my Hard drive on computer. Is this client-side or is this an issue with the actual launcher? Also, I re-downloaded all the launchers, and still, nothing happened.