Free Laptop Online Offers---do they work???

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My laptop is having some trouble. Its an older model and I want to get a new one. I was browsing around for one on the web, and I saw one of those "WIN A FREE LAPTOP!" banners. I clicked it and read the fine print. I researched a few of them. You have to sign up for between 6-18 offers to get your free laptop! And these offers arent all cheap. Or one website offered a free laptop with the completion of one (around $100) offer and the referral of 20 friends to do the same. I could never convice 20 people to do this, and I'm scared to pay any money on the other offers because I dont want to get ripped off and get no new laptop in the mail. Has anyone ever tried any of these? If you have, did you get your free laptop?