windows xp home edition

Hi techies,

help me out with this one.

I USE WIN XP HOME EDITION. I HAVE REFORMATTED MY HARD DRIVE 4 TIMES BECAUSE OF A REBOOTING PROBLEM.ANYTIME I LOG ON TO THE INTERNET USING DIAL UP IT GIVES ME A 60 SECONDS COUNTDOWN.AFTER REFORMATING ITS SOLVES THE PROBLEM FOR A COUPLE OF WEEKS AND BACK TO THE SAME PROBLEM.

SHOULD I CHANGE THE OS TO XP PRO
SOLUTIONS WELCOME