Have XP operating system, Comcast service, Airport extreme router and a Linksys wireless N antenna. Windows say: Cannot configure this wireless connection. What's wrong?

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What is the Operating system on your computer ?
If it is XP then in the bottom right hand corner you will find Wireless network connection ( looks like 1 computer monitor). Use that icon to connect to the wireless network.
If it is windows Vista, then in the bottom right hand corner you will find 2 computer monitor icon. Use that icon to connect to the wireless network.
If it is Windows 98/ME/2000 then use the adapter utility to connect to the wireless network.
For MAC you will see the AIRPORT icon at the top.

Check the wireless settings of the router first . Make sure that yopu have all the wireless settings of the router. If you are not sure about the settings, then open the router set up and check the settings.

Click Here for step by step instructions on how to connect to the wireless network and troubleshooting steps

The antennas in the Macbook Pros have had an issue with reception due to the aluminum housing of the laptop but, should still receive decent reception just not as much as a plastic Macbook or plastic PC laptop. It could be possible that the antenna's cables have become disconnected from the Airport Extreme card inside your Macbook Pro, that the card itself is faulty or damaged or that the Antennas themselves have been damaged in some way. As always make sure you have the latest updates and have installed any driver updates from Apple regarding your Airport Extreme card. Here's an article that may help eliminate any wireless interference that may be affecting your signal strength. Apple - Wireless Interference hope this helps, if so don't forget to comment, vote, etc. Thank you.

Unplugging the wireless router and connecting it again should not have altered the wireless connection/configuration. You have connected the cables correctly because the Internet works when you connect a LAN cable to the router.
The Linksys wireless configuration or the wireless card configuration in the computer was changed it to lose the wireless connection. The wireless card configuration needs to be changed to match the wireless router's settings or change the Linksys with new configuration settings and configure the wireless card accordingly.
To secure your router with a login password and wireless security, please follow my instructions - click on this link :-
http://www.fixya.com/support/r3559128-wireless_router_security
Should you need further assistance, please leave me a comment.

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If it is XP then in the bottom right hand corner you will find Wireless network connection ( looks like 1 computer monitor). Use that icon to connect to the wireless network.
If it is windows Vista, then in the bottom right hand corner you will find 2 computer monitor icon. Use that icon to connect to the wireless network.
If it is Windows 98/ME/2000 then use the adapter utility to connect to the wireless network.
For MAC you will see the AIRPORT icon at the top.

Check the wireless settings of the router first . Make sure that yopu have all the wireless settings of the router. If you are not sure about the settings, then open the router set up and check the settings.

Click Here for step by step instructions on how to connect to the wireless network and troubleshooting steps

Buy a Wireless Router.
Select any of this following:
LinkSys

NETGEAR

Belkin

D-Link

Good luck!

get the Linksys wireless router with hot spot feature.

here is video of what you need.

http://www.youtube.com/watch?v=PwnhggrwfYg

moer info here

http://www.howtoforge.com/wireless_hotspot_howto

You may need to install the driver.
http://www.apple.com/airportexpress/

If you go into the network properties of the wireless adapter you should see a tab that says "wireless networks". In the list of saved wireless networks you should see the name of your wireless network, if so delete it from the list and click ok. Try to reconnect now, I noticed this happens alot when you enter in the wrong WEP key in windows xp. hope this helps

have you reset the airport extreme? theres a tiny hole you can push in w a paperclip. Also, do you have the latest firmware?