Still can't play online!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

[Cat Icarus]

My game won't play multiplayer on my desktop, I have the steam version and I'll click multiplayer it says connecting, but never does. I long onto my account on my laptop and it runs the game's multiplayer just fine. MY desktop is better than my laptop I don't understand and it is really frustrating!!!!! Also when you answer this take into account I'm not good with computers, and...just make it as simple as possible.