IPhone3G won't reset. Apps don't work?

Hi, my iphone3g will not reset. I hold the home and sleep button like you're supposed to and it won't reset any more. It goes to the slide to turn off screen. I've tried turning it off and back on for an hour and it still won't work. My apps whenever I click them they open then take me back to my home screen. Does anyone know another way to reset my iPhone? I don't want to lose anything on my phone I just want to restart it so my apps will work again

Connect it to itunes and try the reset factory settings button

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