Setting up a wired/wireless network at home.

I am trying to set up a wired/wireless network. I have a Sony Vaio desktop
with a Realtek RTL8139/810x ethernet card. I am on the Yahoo DSL connection
to the internet which connects to the Realtek card through a Linksys
Broadband Router WRT54G. I have a wireless Linksys card in my Dell Inspirion
lap top. I can access the internet through a shared connection wirelessly on
my laptop. Following instructions on how to enable file and printer sharing
from Microsoft I get to select network component type and I am told to double
click "Service". When I do this I get a popup message, Select Device, telling
me that Windows is unable to find a driver for this device. What I don't know
is what device they are talking about. Are they talking about my Realtek card
or some other device. If it is my Realtek card I am having trouble finding
drivers on it on the Net. Please any help will be greatly appreciated.
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Jack learning something new everyday.