Can you take a screenshot of the green lines? That really does sound like graphical glitching either due to overheating for faulty drivers. If it doesn't show up on a screenshot (ie if the screenshot look normal but the game doesnt) then it's almost certainly an overheating or failing graphics card.
As for the first issue, go to options and hit the second browse button. Navigate to the patcher that you use in the directory listed in the properties of the shortcut you use to launch EQ2.
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