bug

Put the summary of the bug you're having here

What I expected to happen was...:
Describe what you thought should happen here
i downloaded 1.8.1 and it did not open when it downloaded

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. ...tring to open minecraft
3. ...it opens then gose away very quikly