Using Wireless Router??

ok, i have to setup a small network for a friend, she already has a Wireless Router.. now, the router works fine with the Computer that's right next to it. but she has another Computer she just bought that's like across the house downstairs.. and she needs it to be Hardwired to the router, cause teh signal blows..

Is there any settings i have to change so this can work?
or can the router only work as a wireless, or vica/versa.

never worked with a Wireless router before.

so she wants one pc to be on wireless, and the other hooked up with a wire on teh same router.. can this be down? and is there anything i will have to change in settings??

thanks alot guys.

RIG
Asus A7N8X Deluxe
80gb Maxtor
Lian-Li PC-60
Lite-On 52X
AMD XP2800+
LeadTek GeForce 4 Ti4200 w/vivo 128mb 8x
Hitachi CML174
1 GB Corsair XMS PC3200 Cas2

not sure, it's a LinkSys Wireless router, the Front says 2.4ghz or something.. i assume its a newer model, probley bought from either best buy or circuit city

RIG
Asus A7N8X Deluxe
80gb Maxtor
Lian-Li PC-60
Lite-On 52X
AMD XP2800+
LeadTek GeForce 4 Ti4200 w/vivo 128mb 8x
Hitachi CML174
1 GB Corsair XMS PC3200 Cas2

I think that model has 4 rj45 ports on the back so you can run a wire. Personally I have no problem running wire and that's what I'd do if I were you. If you don't want to run a wire, I think they make signal boosters that may help the signal drop.

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