The goal of this clinical trial is to learn if virtual reality combined with conventional physiotherapy intervention works to treat moderate to severe multiple sclerosis persons. The main questions it aims to answer are: * Does the application of a virtual reality-based program along with conventional physiotherapy produces improvements compared to the application of conventional physiotherapy and placebo virtual reality in motor aspects of patients with multiple sclerosis? * Does the application of a virtual reality-based program along with conventional physiotherapy produces improvements compared to the application of conventional physiotherapy and placebo virtual reality in cognitive aspects of patients with multiple sclerosis Researchers will compare a virtual reality-based program along with conventional physiotherapy with a placebo virtual reality to see if virtual reality improve motor and cognitive aspects of multiple sclerosis. Participants will: * Visit the clinic twice a week for 10 weeks to receive a 1-hour session of virtual reality and conventional physiotherapy. * Be assessed using various scales and questionnaires at three different times: at the start of the study, at the end of the treatment, and 4 weeks after the study ends.