Unable to Connect!Follow

Hey guys hopefully you can help me out with this problem i am having. Ever since yesterday morning every time i have tried to log into World of Warcraft i get an "Unable to Connect" message. I have NO IDEA why I am getting this. It works fine on both my brothers computers. We have cable and are connected to it through a router. Once again their computers work fine with it, its just mine and i have the best computer in the house. But anyway i dunno if it is the router because i can play other online games just FINE. It's just in the past day i have been totally unable to login. I have tried nearly everything i can think of. I changed my firewall settings to no avail. So i reset them to what they were. I even turned off my firewall nothing. I uninstalled and reinstalled the game 3 times. Everytime i am able to login and dowload the patches until i have the March 22, 2005 patch. After this it always says "Unable to Connect." Im wondering if its a bug or something in the patch But i dunno how because i was playing fine after i first got the patch. It all just started yesterday morning. I know the servers are fine because i have played on my brothers computer with my guy. The server i am on is Argent Dawn. Please if anyone can help me i would be very grateful. Thanks in advance!