How can I open my Win XP screen to full size?

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If you mean that your screen isn't filled, most monitors have an auto adjust function that will fit it best to your monitor. You may also want to check your screen resolution and change it to the "Native" resolution (the resolution that the monitor was designed for). this can be done by right click your desktop, then click personalize, select the screen resolution tab and adjust according to your monitor....Show more

It seems that problem is not with windows XP but the monitor you are using.
See the manual of your monitor to adjust your screen. Buttons on a typical monitor are used to set horizontal and vertical position of output area of monitor....Show more