You said that when you connect the computer to the modem, you get limited or no connectivity. make sure that your computer will be able to go online when you connect it the modem directly.
If your computer is able to go online through the modem
Then you need to connect the computer to the router ad the modem to the router.
open the set up page of the router and change the settings of the router according to the ISP.
Click Here for step by step by instructions
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