Networking help needed please!!

Have no fear, it is possible to do what you like.

My laptop is connected to modem of my daughter's with wireless usb.

I think it is possible if you have the modem which supports the ethernet connection. just plug it to the RJ45 cable or LAN Chord to the modem and the PC that you want. I dont what kind of modem or router you are using but it is perfectly possible to connect your pc with the same modem. For more info read the user manual of your modem.

Of course you can. There are 2 options available for you. You can either connect the computer to the router via a RJ45 cable, or you can install a wireless PCI card and use the wireless access.
If you have several computers then there is no reason why you should not connect them all, although the number of wired connections would be limited by the number of ports on the router.
If you set up a home network then you can access the files on one computer from another as well.

You need to Buy a Wireless Card & the Software needs to be Installed First then the Card needs to be Configured to Work in Your P.C. It may Work after Your Install the Software & then the Card as the Instructions will Say. Some P.C.'s
may Require extra Configurations Settings and it may not Work, as You may need
to Contact Your Network Card Manufacturer, ISP or Phone Company depending on
What Service You Use. They can Help You Set the Proper Configuation Settings. All
will Work through Your Modem. Good Luck.

Hello There.

Sure, if you already have a highspeed connection and a wireless router then you can add computers there. Others can be wired to your router's ethernet LAN port and the rest can be wirelessly connected to your router's signal.

What brand of router do you have? My wireless router has 4 ports for ethernet so the way I've had it set up is that I've had two computers connected vi rj45 ethernet and the rest connected wirelessly.

So, the modem ---> wireless router --< splits off - 1) wired to computers in home office 2) wireless so that roomies who have wireless cards in their computers can use wirelessly, and also laptops can roam about the house wirelessly.

Basically it depends on what type of wireless router you have if you want to do a setup similar to what I describe here.

Good Luck!:)