Keeping the Page Size to 100 percent

I teach a portfolio class for my students at Northern Illinois University.

Currently we use CS3 with Acrobat 8 to create our portfolios.

We often convert our Word files for the portfolios
by printing a Word Document to PDF.

Unfortunately, when we click on the new PDF file, it opens at more than
200% of its original size. I want to know how to have the PDF open at 100%
or less of its original size.

It is a pain to change the viewing size for every new document in
the portfolio. It would be nice to open to a page that fits nicely on the
opening screen without making any initial adjustment.

Thanks,

Joe Scudder