Problem with HP deskjet 870 drivers and

When the Deskjet 870Cse drivers are loaded on an NT machine with SP6a (Service Pack) Word slows way down. It happens with Office 97 and 2000. I only have to select the DJ870 (Deskjet) as default and things slow down. If I select any other printer asdefault Word is ok. This only happens with SP6a. I loaded the same printer and drivers on an NT machine with SP5 and there is no problem.