Acer H233H viewable screen area question

Had a quick question regarding the Acer H223H widescreen LCD monitor. I just got one this past weekend for free and I set everything up.

I noticed that I set it up to run at its max resolution of 1920x1080 however the displayable screen area doesn't seem to be maximized. What I mean by that is that there appears to be about a 1/2" border of black area between what is displayed and what could still be shown on the screen. I did notice someone mentioned this on newegg under customer reviews:

"CCC Advanced Graphics Settings -> DTV (DVI 1) -> Scaling options ->

Theres a slider marked Underscan/Overscan. Setting the slider to max overscan fixed the issue. Just thought i'd post my solution if anyone else is getting the same issue."

I have yet to try this but will do so as soon as I get home. Can anyone explain though why the screen doesn't automatically use up all available space or any other solutions in case the above solution doesn't work?

Thanks.

Try installing drivers for HDMI for that monitor as it probably identified as Plug and Play monitor by you system.
They have Vista drivers on their website. If you have XP you can still download Vista drivers and install it on XP. I fixed all problems with my monitor by doing this.

To install vista drivers on XP:
1. Go to device manager.
2. Expand your monitors list there and double-click on Plug and Play monitor.
3. Go to driver tab and click Update Driver.
4. "Not at this time" for question about connecting to Windows Update.
5. "Install from a list or specific location (Advanced)"
6. "Don's search, I will choose driver to install."
7. Click "Have Disk" and point to your Vista drivers folder, choose HDMI ones (x86 or x64 according to your operating system).
8. Reboot.

That should do it.