In Section 2 (and as many others as necessary), go to Format Page Number and
set it to "Continue from previous section." This is the default setting for
new sections, so you must have restarted the numbering at 1 at some point.

Word cannot  handle page format changes (such as orientation, size, number of
columns, and margin changes) without changing to another section.  If you
have both portrait and landscape pages in your document, it very likely does
have sections.  

You ca fixyour page numbers by going into each header/footer, choosing format
number, and change whatever is there to continue from previous.  (My terms
may be a little off.  I'm now a regular user of W2007, and I don't have W2003
available to check the  feature names and choices.)

Hope this helps,
PamC

You have sections - you cannot have landscape and portrait in the same
doc without sections.

If you change a page to landscape and select This Point Forward, Word
inserts a section break.