Quick question about IE7 and window sizing...

I have forgotten how to ensure that new windows will open up at a certain (read full page) size. I know it is simple, but I can't remember how to do it. Just resizing the window and closing it doesn't seem to be working for more than my original window. All subsequent windows are opening to a tiny size.

Just a note...I just built this system and it has a fresh install of xp sp2. I also just installed IE7...I don't know if this has any bearing on the problem, or if I need to change a setting or something. Any help is appreciated.