Crash Problem

I expected it too let me log straight into minecraft so I can get playing..

I could get on and play with my friends

It gives me a crash error every time I click the play button
I get a lot of scripts and I cannot really understand them besides what it says about initializing and than java etc.
1. Open up the minecraft launcher and log in

2. ... Click the play button

3. ... Look as it gives me a crash report