 Patients receive cidofovir IV weekly for 2 weeks prior to beginning radiotherapy and then once biweekly during radiotherapy. Patients undergo external pelvic radiotherapy for 5 weeks. Beginning 2 weeks later, patients undergo utero-vaginal brachytherapy. Some patients may also undergo a second course of external radiotherapy to the parametrium andor lymph nodes 3 days after brachytherapy. Patients also receive concurrent carboplatin IV once weekly during external radiotherapy and brachytherapy. 