Risperidone will be administered at an initial dose of 0.5 to 1 mg/day and will be titrated upward to a dose considered optimal by the investigator based on the subject's clinical response and adverse events, but not to exceed 2.0 mg/day by the end of the second week. Subsequently, risperidone may be increased based on clinical response and tolerability to a maximum of 4.0 mg/day. As needed study-prescribed (prn) use of lorazepam will be allowed for the management of affective and anxiety symptoms for the first two weeks of the study; a maximum of 2 mg per day will be allowed during the first week, and a maximum of 1 mg per day will be allowed during the second week. During the second week, the subject must be tapered off the lorazepam. For the final six weeks of the study, no lorazepam will be permitted. Zolpidem (10-20 mg/day) or zaleplon (10-20 mg/day) will be allowed for management of insomnia, and benztropine (0.5 - 3.0 mg/day) will be allowed for management of extrapyramidal symptoms. The latter three agents will be permitted throughout the study.