Is this happening from the moment you start playing or after you Alt-Tab out of the game at some point? If you're Alt-Tabbing this is a know issue. See the below thread.
http://www.project1999.org/forums/sh...ad.php?t=99390
There are a couple ways to make EQ look like it's full-screen while windowed. (What I do with mine.) I remember seeing a thread on it it. I'll see if i can turn it up.