How the screen is displayed is determined by the amount of resolution and
the size of the active Window. At some point on the zoom scale Word will
choose to display two pages rather than one and it sounds as though that
occurs on this screen at 75%. Obviously if there is only one page to display
it will be on the left. If you grab the right size of the window and drag it
to make the window narrower, does the page jump to the centre at some point?
You may find that changing the zoom to (say) 78% or 80% reverts to single
page display. You can check the threshold by setting the zoom to two pages.
Make it 1% larger.

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Graham Mayor - Word MVP
My web site www.gmayor.com
Word MVP web site http://word.mvps.org
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> Someone using Word 2003 has a problem in that at 75% (which she
> prefers) the page appears at the left side of her screen instead of in
> the centre. I can't find any way to make it appear in the centre of
> the screen - any ideas please? I've tried it on several other PCs and
> it always comes in the middle, but I can't find any different setting
> that could be causing it.