Desktop connects to WRT300N, but no internet

I have a Dell Dimension 8800 with a 2.4 GHz Wireless-N PCI adapter talking to a Linksys WRT300-N Wireless router.  The Linksys software says that the connection has been established and that the signal and strength are excellent.
However, when I launch IE v6.x, it can't see anything.  I've erase all cookies and temp internet files, and still won't connect.
I also have a Dell Inspirion E1505 that has an internal wireless card and its connecting with no trouble. 
Any and all help will be appreciated. 

Hi, and thanks for the response.  I did as you instructed, and the computer could never acquire an internet address.  I then tried to fix by modifying properties of TCP/IP by forcing the use of the following addresses:
IP: 192.168.1.25 (I didn't want to use "20" as there is already another computer with a wireless conection to the router)
Subnet Mask: 255.255.255.0
Default Gateway:  192.168.1.1
Preferred DNS Server:  192.168.1.1
I was then able to establish a connection, but could still not reach the internet.  So I went back into the TCP/IP configuration and added the following DNS suffinx:
hsd1.ut.comcast.net.  (That is the DNS Suffix running on my laptop, which already has a good connection)
But even with those additional modifications the computer sees and communicates with the router, but can't access the internet. 
Could it have anything to do with security?  My laptop is using an internal wireless adapter that it came with and I don't know th emake but it almost certain it is not a linksys.  It is using WEP security.  The new wireless adapter (WPM300N) that is giving me the headache is using PKS (I think thats the acronym)  I tried getting the WPM to go to WEP, but it loses the connection.

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