stays on mojang screen for a while then just crashes

Put the summary of the bug you're having here

What I expected to happen was...:
Describe what you thought should happen here
minecraft opens normally
What actually happened was...:
Describe what happened here
stays on mojang screen for a while then just crashes
Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...click on application
3. ... opens and crashes