How do i make my laptop/notebook a wireless modem?

We have a modem at home but it doesn't have built in wifi so we have it connected to a router. We have fast internet (ADSL2 i think) but running through the router, it's very slow. So i was wondering if i could somehow make my laptop a modem? Or a router as well because it would have to be faster than the one we have now. Im running a Acer Aspire 1830 Notebook 32-bit windows 7

Thanks. Oh and please use simple language when replying, i have a general understanding of what you may be talking about but nothing too high tech please :)
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More about make laptop notebook wireless modem
  1. what is the speed when you connect the laptop directly to the modem?

    what is the speed when you connect the laptop to the router?

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