The purpose of this study is to provide data on the dose response of simvastatin in lowering LDL-C when it is co-administered with valsartan in patients with both essential hypertension and hypercholesterolemia. The primary objective of the study will be to show that the combination of valsartan 160mg/simvastatin 40mg has superior efficacy compared to the combination of valsartan 160mg/simvastatin 20mg in percentage change from baseline in LDL-C.