I downloaded a texture pack to my minecraft today. It lagged out and crashed when i put it on. Now everytime i try to open up minecraft it just crashes. Please help? 1.7.9 it didnt let me put 1.7.9 :(

Put the summary of the bug you're having here

What I expected to happen was...:
Describe what you thought should happen here

What actually happened was...:
Describe what happened here

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...
3. ...