I. To define and describe the toxicities of temsirolimus in combination with bortezomib, rituximab, and dexamethasone. (Phase I) II. To evaluate time to progression of bortezomib, rituximab, dexamethasone +/- temsirolimus in patients. (Phase II) III. To evaluate major and minor response by 6 cycles of therapy of bortezomib, rituximab, dexamethasone +/- temsirolimus. (Phase II) IV. To evaluate time to response and duration of response of bortezomib, rituximab, dexamethasone +/- temsirolimus. (Phase II) V. To evaluate toxicity of bortezomib, rituximab, dexamethasone +/- temsirolimus. (Phase II) VI. To evaluate time to next therapy of bortezomib, rituximab, dexamethasone +/- temsirolimus. (Phase II) VII. To evaluate overall survival of bortezomib, rituximab, dexamethasone +/- temsirolimus. (Phase II) VIII. To describe treatment-related fatigue, physical and functional well-being during and after treatment. (Phase II) IX. To compare the change in treatment related fatigue, physical and functional well-being over 6 cycles of bortezomib, rituximab, dexamethasone +/- temsirolimus. (Quality of Life) X. To prospectively assess health-related quality of life longitudinally (pre-treatment to 3 year follow-up assessment) among trial participants. (Quality of Life) XI. To describe treatment-related peripheral neuropathy associated with bortezomib neurotoxicity. (Quality of Life)