Monitors don't need drivers. If you can't adjust the width on the monitor iteslf, try changing it's type to an Acer15p. This will give you access to different refresh rates.
TAKE CARE when using them - you may select a rate too high for this monitor - if you do, wait for 15secs and it should automatially change back again - do not panic or you'll have even more hassle.
You may find a refresh rate/resolution setting that fills the screen - if you don't then you'll have to live with it - old monitors are like that I'm afraid.