you can try using your own custom style sheet, and setting:
body { font-size: 28pt;}
or you can try
body { font-size: 2.5em;}
or
body { font-size: 250%;}
Play around and see what gives you the results you like best.
btw, you set it by putting that 'body' line in a text file, then going Tools->Internet Options->General Tab->(bottom right) Accesability -> check off "format documents using my style sheet" -> browse to that text file you made.
bart