lktknow

I am borderline computer literate.
I just purchased a new computer that has windows Vista on it. I had Road Runner installed on it, with a cable modem. I want to have Road Runner on the other 2 computers in my house.
Before I had a Linksys router hooked to all three computers, but now that the Road Runner has a cable attached to it, I'm not sure how to go about connecting the other two.
I had thought I could get a wireless router to connect them, however, the two Toshiba laptops have wireless cards in them, but the new computer I just got does not.
It has no wireless information in the system?
Could someone help me out with this problem, thank you.