Is it shift? I thought it was control.
At any rate, do NOT maximize it.. IE will NEVER EVER remember that you like to open new windows at that size. Why tf does this happen? It's been that way since IE 4 like 3 years ago, you'd think they'd do something about it.
What you'll have to do is resize the window manually so it's pretty much maximized. Do the control or shift and close the window, close IE completely, try it again a few times.. IE isn't always the sharpest knife in the drawer and you may have to do it MANY times.
And for anandtech, I just type forums.anandtech.com for that reason you complain of to avoid the hassle.