Diablo 3 not launching for me! D: Pressing play just makes the launcher sit there.

So after all this anticipation I finally got home and went to play my pre-installed copy of Diablo. So I opened up the launcher and pressed play. The launcher then just sat there staring at me saying launching. So I left and went to do my drivers test (passed and got my license). Then I went and painted 2 pools and got home 6 hours later. Diablo was still trying to launch..... So this post is more of a : Lets all figure this out together and try each others fixes and get our games we paid for to work so we can have fun! Leave any or all of your fixes in the comments below and make sure to come back and check every once and a while to see if anyone has fixed it!