Error Code HELP!

Hi, I keep getting error code EC: 10005, despite uninstalling and reinstalling app as well as rebooting computer multiple times. I've had this problem since April and have spent hours upon hours trying to fix it. It's not a modem problem it's not a display problem as some people have said to change my refresh rate, which I can't even change because I'm on an IMac. I'm DYING to be able to play again but nothing is working! Someone PLEASE HELP! Thank you.