Google search box results?

Vista Business, SP1

I'm not sure if this is the right place to ask this question. If it's not, I
apologize, but hope that someone can point me in the right direction.

When I search for a file on my computer using the search box that comes up
above the Start button, I get inconsistent results. By that, I mean this: I
have a particular Word document that contains, let's say, the words "apple"
and "banana." If I search for the word "apple," that Word document will be
shown in the results. But if I search for the word "banana," that Word
document will not be shown in the results.

This anomaly makes me doubt all of the other searches I do.

FWIW, the computer's been in service for about a month, and the particular
document has been there the whole time, so I don't see how it hasn't been
indexed yet. Besides, why would the search find one word, and not the other.
It's obviously searching that document.

I've come across a few specific words that the search doesn't discover in
that particular document. I really have no way of knowing if other documents
act this way with Search--it's just that I know that this particular one
does.

Thanks.

Ken Isaacson
SILENT COUNSEL, a legal thriller
www.KenIsaacson.com