Laptop in the car???

So I thought I might get a laptop with a mobile internet. Because then I get all the techno u. trance stations in via the WMP, because there is no one in the normal radio. Well and because I wanted to pull electricity over over cigarette lighters just as if I was charging a mobile phone! And because laptop just wired on the radio. Is that possible at all? Because I calculate e.g. with a lot of sound loss through the sound card. Or that the forhaben doesn’t work at all. Thanks for every answer!!! Oh yes because of current w I should attach a Maxxim DC with 90 A.