This is my first post in the tech forums so don't take my word for anything more than just trying to help.
Try going into your eqclient.ini file and edit the line for windowed to windowed=TRUE. I've heard of people having issues in windows 8 with full screen mode. If that doesn't work you may try right clicking on your EQ icon and set it to run in compatibility mode for Windows 7 or XP. Let me know how it works.
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Halius Manashaper <Ex Astra>
55 Conjurer
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