Need to keep old Yahoo! Old HP 750 printer won't work with IE 7,8, etc?

XP SVC PK 3. If I upgrade to upgrade to IE 7,8,9 to upgrade to new Yahoo, I don't think my printer will work. I don't think HP750 works with new IEs. How do I keep the OLD Yahoo on home pc so I can see email, and keep OLD printer working (seldom print; refillable cheap ink). On home pc, I cannot get out of the new Yahoo upgrade pages in order to retain old version. Couldn't access Yahoo mail from home this morning. Help, where's the default to keep old Yahoo version?