J055Y_ One solution that tends to work is this:Copy the link from your error log (http://launcher.mojang.com/mc/launcher/win/703e21de391ba20ebee6fae3a694d0b7514febb5/MinecraftLauncher.exe) into your web browser. The latest version of the launcher will be downloaded. Following this, you will need to replace the old launcher in your minecraft directory with the new one.
