Well, that's the problem. Your computer was made before 16:9 monitors were the norm. You might try making sure your video card's driver are completely up to date or you just need to install a new video card. You can pick something up from newegg for less than $40 that will work fine. I would guess from the age you're going to need an AGP card.
Something like this:
http://www.newegg.com/Product/Produc...82E16814187180
No idea if this is what you need, just a guess.
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