Treatment: Study participants will be treated with carboplatin and temozolomide. Carboplatin will be administered through intravenous infusions. Temozolomide will be given through oral pills. Before these drugs are administered, study participants will undergo a pre-treatment evaluation with physical and neuropsychological examinations, neuro-imaging, laboratory tests, quality of life assessment, and other procedures. Carboplatin will be given for two consecutive days. Temozolomide will be taken by study participants daily for five consecutive days. Both of these treatment schedules will be repeated every 28 days. Several tests and exams will be given throughout the study to closely monitor patients. Study treatments will be discontinued due to disease growth or unacceptable adverse events.