It Keeps Crashing When I Try And Play

Whenever I Try And Open My Minecraft In Ay Version It just Crashes Me And I Don't Know Why. I've Repaired It Already And It Didn't Work, and I Haven't Been Able To Get On For A WEEK And It's Really Bugging Me.
So This Is What I Do

1.Open My Minecraft Launcher And Look At My Version It Was 1.7.9 (P.S Take To Note I Have Tried To Use 1.8 & 1.8.3 And Still Has NOT Worked)

2.I Click Play

3.I Click Multiplayer And Click A Server (I Have Tried All Servers)

4.I Crash And Lose Connection

Please Help Me I Am Very Confused And Some Other Notes Are That I Have Tried To Delete And Reinstall But It WON'T Work It Just Plain OUt Refuses. >=(
Here's A Pic. Of Cat If U R Stressed. But Seriously I Need Help.