Solved it!
Click on diablo 3 in the client then top right hand corner click settings.
Then click the Game Settings tab and tick the box “Enable 32-bit Client” and now i can finally log on to the Americas server.
Hope this helps guys 
Oh nice this fixed it for me, thanks!
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Thanks for sharing! I’ll be posting on the main thread for this issue here:
Let’s continue the discussion on the main thread. Closing this thread.