This is an investigational study. 90Y-Zevalin is approved by the FDA for relapsed and refractory lymphoma. Its use in this study is investigational. 111In Zevalin, Carmustine, etoposide, cytarabine, melphalan, and Rituximab are all FDA approved and commercially available. However, their use together in this study is also investigational. Up to 50 patients will be take part in this study. All will be enrolled at MD Anderson.