Not getting full screen on 22" monitor in Portrait mode

I just good dual Dell monitors, one 20" and one 22." I want to set them with the 20" for my browser in landscape and the 22" for writing in portrait.

I was able to do that except for one problem. The 22" in portrait doesn't fill up the entire screen. There is about 4" of black on the top and bottom (kinda defeats the purpose).

The 22" is set for the recommended resolution (1680x1050) and that's as high as it goes.

Any ideas?

Check this great tutorial out....
Screen Resolution - Display Settings

you may have missed clicking on a box in Performance Settings!
Welcome to 7 Forums.

It worked! Many thanks....

Glad it worked...You are more than welcome.
If you run into other problems along the way just do a search and check the other posts for a quick answer.
Otherwise just create a new post and someone will be along to help you.
In the meantime check out all the great tutorials.
Have a great day.
THW