Crash diets and quick fix regimes nearly always fail because the body just does not react in a natural positive fashion. Your metabolism will be messed up which could result in a crave mode developing, where you have to go to extremes to keep the calories up. This is not the way.
It's much safer to go at a steady pace, building up confidence and keeping stable. Losing weight naturally in a stress free fashion is best. Reduce portions first, stick to what you're used to initially, get into exercise gradually THEN you can think about slight changes to carbs and fat intake. When you're ready increase exercise and re-adjust your diet and in time you'll succeed in losing weight for good. I have a hub on breakfast ideas that may be of help.
The only people who need to lose weight super fast are boxers when they're a few pounds overweight and other sporty types. But these people are usually trained athletes with professional dieticians around to advise..