First, if you really want to get rid of that overweight, you'll need to change your lifestyle, as edhead2000 said.
Second, you need to increase aerobical work to at least an hour a day (with no breaks). That is, either walking, running, cycling, rowing, dancing, swimming... You choose one and the intensity. For people heavily overweight, beginning in the swiming pool is best, as otherwise they could overstressed knees and ankles.
Third, you'll need to have a look at what you're eating. If you're lucky and haven't developed any form of diabetes, then, taking out saturated fats (cocoa, palm and animal fats) and sugar would help you. If you can use olive oil for fries, then, wonderful. But start by not eating doghnouts and the likes. And try to eat vegetables and fruits once or twice a day.
Four, try not to over eat, but do not starve either, otherwise, your diet won't last long. Ask for an individualized diet made by a pro.
And lastly, do not take out carbs completely or you'll end up with liver problems.
Hope this helps a bit.
LucÃa
BS in Food Science