i dont know what it is but its annoying. i deleted all my Minecraft files and it still wont work it keeps crashing

Put the summary of the bug you're having here

*What I expected to happen was...:*to download and work
Describe what you thought should happen here

*What actually happened was...:*it crashed when i was trying to download the new update 1.6.1
Describe what happened here

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