Crash upon starting 1.7.5+

Whenever I try to launch Minecraft in a version higher than 1.7.4, I get to the Mojang screen and it crashes. This is the screen it then gives me:
http://pastebin.com/m6BBjhEn

The crash screen says an error report file has been saved, which says this:
http://pastebin.com/yZn6sTWq

I've been playing Minecraft for about 5 years. Hopefully this can be fixed so I can continue playing.