I had the same problem. Here's what fixed it:
1. Find out your screen resolution with this site (or others):
http://www.whatismyscreenresolution.com
2. Follow the instructions in part 1 here (copy+pasted below):
http://www.project1999.com/forums/sh...ad.php?t=94928
"Go to your EQ folder. Find the file eqclient.ini and open it in a text editor (i use notepad, its the simplest to use)
hit ctrl+f, type windowedwidth, you should see something like this:
WindowedWidth=1280
WindowedHeight=768
Width=1280
Height=768
FullscreenBitsPerPixel=32
FullscreenRefreshRate=0
WidthWindowed=1280
HeightWindowed=768
change it to this:
WindowedWidth=800
WindowedHeight=600
Width=800
Height=600
FullscreenBitsPerPixel=32
FullscreenRefreshRate=0
WidthWindowed=800
HeightWindowed=600
I'm using 800 x 600 here, but you may need to fiddle with that a bit. If 800 x 600 isnt working,
try using your monitors native resolution instead. Eventually, you will get a combination that works, just keep trying."
I went straight to using my monitor's resolution. I hope this helps.