oric_dan(333):
Shoot, I just bought a Mega 2560 R3 board, and I couldn't even get the board to install.
It doesn't actually tell you how on the main Arduino page. I had to search all over heck to
find the solution, and finally found it in a forum thread.
Don't feel bad, I just bought a Leonardo today, after installing the innumerable drivers, tried to upload "Blink", but it failed at the last stage saying couldn't find the serial port. All those drivers wasted. I have got it sorted yet, because it arrived the same day as my new AVR Dragon. No chance with that sort of competition for my attention! 
Maybe Team Arduino should just release better designed and tested hardware and software products in the first place. Now there's a radical thought.
Someone once asked me what I thought of Arduino quality control. I said it would be a very good idea...
By the way, anyone know how to upload "Blink" to a Leonardo?