I just got done putting XP pro back on my laptop after I screwed it up with slackware. My laptop screen size is a 15 inch, but its like windows is only using 12 inches of it. All around the edges is black. Kinda like when you have to resize a screen on a regular monitor to make it fit better.

I can't figure it out to resize the Windows screen to where it uses all of my monitor size. Any help would be good