Halo in window trouble

[VOX]

I've got two screens running now and I got Halo to run in a window.
Now, when Halo opens a separate window appears , so far, so good.
But the windowsize is about 1/3 of my screen and I can't get it bigger.
It's set "maximized" in the shortcut but it doesn't open maximized.

Can anyone tell me how to get a bigger window size?
I run Win7

Edit: I can get the window bigger by pulling the edge but than the quality of the image goes down.
I'm looking for a way to open it bigger, with good video quality.

[A§H»rUnRiÕt]

Try changing the resolution in settings. If that doesn't work reply, I've got another solution in mind also

[VOX]

Worked like a charm, I was so fixed on settings in win7 or stuff like that,that
I forgot the obvious

Thanks :thunbsup