Please help with ADSL wireless dilemma
I've just got broadband for the house, but the wireless router can't reach the room above the garage where I'm living. Because it's 30 feet away and through two walls. As a result the house is still on dial-up, and the garage is on broadband. Most specifically have got to get it to reach my mom's computer desk/shrine. It is very precious and disrupting my mom's computer habits causes holes in the space-time continuum involving plague and storms.
The signal almost reaches her computer desk, it is still several feet away from a stable signal. What can I use as a relay in the house, what is the most cost-effective solution, short of moving the garage or my mom's computer shrine area?