The purpose of this research study is to evaluate the safety, tolerability, and efficacy (how well the drug works) of risperidone compared to placebo (an inactive drug) in the treatment of bipolar disorder with panic disorder or generalized anxiety disorder. Risperidone is currently approved by the United States Food and Drug Administration (FDA) for the treatment of schizophrenia and bipolar mania. Risperidone is not currently FDA approved for the treatment of bipolar hypomania with or without panic disorder or generalized anxiety disorder (the condition being investigated in this study).