How do i fix my router conection??

ok i have this problem, i have 1 desktop , 1 laptop ok? i have a modem with 500k, normal contract, desktop modem conected to pc, but i bought a router BELKIN trademark version 7001, and i dont know what to do, i folowed up the instructions and the internet falls everytime ( i know this is illegal but i know people who still does this and their internet works perfectly) ( my laptop works good with this internet)i need Fast answers please, im losing patience it was a lot of money trashed(well detailed answer please, no HARVARD WISE explanation cz i wont get it). Thanks for your help i appreciate