Patients will receive placebo for 4 weeks, then Vytorin 10/20 mg for 6 weeks, if efficacy of treatment is achieved, they will continue with Vytorin 10/20 mg + placebo for 12 more weeks, if not achieved, will receive Vytorin 10/20 mg + MK0524A 1 gr for 6 weeks, if efficacy achieved will continue with Vytorin 10/20 mg + MK0524A 1 gr + placebo; if not achieved, will receive Vytorin 10/20 mg + MK0524A 2 gr for 6 weeks.