Vista - Overall Font Size?

(Background: I have two computer systems side-by-side; one
is Windows
2000/Pro, running fine for years, and the other is Vista
Ultimate, running
fine for days. I have converted the Vista computer to the
Classic mode, to
make it appear as similar to the Windows 2000/Pro as
possible.)

Question: Is it possible to change the font SIZE for all
the buttons and headings in the Vista presentations (Classic
mode) of Internet Explorer, Mail, and other screens?

I note that when I have Internet Explorer open on two
similar sized monitors, side by side, one running W-2000/Pro
and the other running Vista that the type fonts are
significantly smaller in Vista. I'm talking about buttons
for Create Mail, Reply, Reply All etc, as well as the very
top line - File, Edit, View, etc.

I have not found a way to increase the size of the fonts in
these buttons and headings.

Best regards to all.