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I have comcast and they suggested I get Netgear because it works best with their hardware. I connected the router fine but the wireless adapter cards that I bought from TigerDirect for some reason will not pick up the router. What am I doing wrong?

Are there any red or yellow marks in the device manager? Run ipconfig /all from a command prompt & post the output.
How do you know when a politician is lying? His mouth is moving.

I have bought two different routers both a G and N. I even purchased a antenna to boost the signal and I installed wireless cards in each of the pc's that has the antenna on the back of the card. What am I doing wrong here?

Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.C:\Documents and Settings\Administrator>ipconfig/all
Windows IP Configuration
Host Name . . . . . . . . . . . . : owner-4d7e0adce
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Unknown
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : NoEthernet adapter Local Area Connection:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) PRO/1000 MT Network Connect
ion
Physical Address. . . . . . . . . : 00-08-74-F4-04-66
Dhcp Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IP Address. . . . . . . . . . . . : 192.168.1.2
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.1.1
DHCP Server . . . . . . . . . . . : 192.168.1.1
DNS Servers . . . . . . . . . . . : 192.168.1.1
Lease Obtained. . . . . . . . . . : Tuesday, May 05, 2009 9:38:54 PM
Lease Expires . . . . . . . . . . : Wednesday, May 06, 2009 9:38:54 PMEthernet adapter Local Area Connection 3:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : USB PowerPacket Network Adapter
Physical Address. . . . . . . . . : 00-12-AB-02-F3-C8
Dhcp Enabled. . . . . . . . . . . : No
IP Address. . . . . . . . . . . . : 169.254.4.167
Subnet Mask . . . . . . . . . . . : 255.255.0.0
IP Address. . . . . . . . . . . . : 172.29.197.73
Subnet Mask . . . . . . . . . . . : 255.255.0.0
Default Gateway . . . . . . . . . :C:\Documents and Settings\Administrator>

This is what I get when I do a NSLOOKUP:
Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.C:\Documents and Settings\Administrator>nslookup
*** Can't find server name for address 192.168.1.1: Non-existent domain
*** Default servers are not available
Default Server: UnKnown
Address: 192.168.1.1>

You have 2 adapters enabled at the same time. Connection 3 is showing 2 IP addresses, one being the APIPA address, which is the same as no IP at all. Disconnect the cat5 cable if you are trying to use wireless. Use all static IPs & the static DNS addresses of your ISP.
How do you know when a politician is lying? His mouth is moving.

Did you try a static IP & DNS entries?
How do you know when a politician is lying? His mouth is moving.

Network places, view all connections, right click on the wireless NIC, go to properties, highlight TCP/IP, go to properties & set the addresses there.
Make sure you have comcast's DNS IP addresses.
How do you know when a politician is lying? His mouth is moving.

If it works on one of them, do it on the rest. I don't know why people have a fascination with DHCP. I can see it being used on large networks or a network that is needed to provide service to visitors but not for networks under 25 PCs.
How do you know when a politician is lying? His mouth is moving.

There's nothing wrong with DHCP, I use it on my computers on my home network. DHCP makes it alot easier to set up computers on the network. Besides, if he was ever going to be using a laptop in the wireless network, it would be tedious to set a static IP and DNS addresses on it everytime you wanted to get online.
Netgear routers use the address 192.168.1.1 as the gateway. It looks like the wired connection has that address. Is the wired connection (Intel PRO/1000) connected to anything? If not, I would disable it. You can do that by going to Control Panel>Network Connections, right-clicking Local Area Connection, and clicking on Disable.
I noticed you said "I connected the router fine but the wireless adapter cards that I bought from TigerDirect for some reason will not pick up the router."
What exactly are you talking about? Is the SSID of the router showing up in the list of wireless networks on each PC with a wireless card? If not, is SSID Broadcasting disabled on the router?
WinSimple Software
CompTIA A+ Certified

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