 Currently, the best treatment the investigators have for preventing or slowing atherosclerosis is to control the patients risk factors such as high blood pressure, diabetes, or cholesterol levels using prevention and specific drugs. Angiotensin receptor blockers ARBs are a class of drugs that have been shown in clinical trials to have many beneficial effects in patients with high blood pressure, advanced heart diseases such as after heart attack and heart failure, and diabetes. However, whether these drugs will also be useful in people with early signs of hardening of the arteries, measured as a thickening of the carotid neck arteries is unknown, and is the purpose of this study. 