Hi guys. I setup a successful wireless network in my home with your guys' help about a year and a half ago. Since a few days ago, my wireless internet seems to be not working.
My laptop's wireless card does not often detect the router often and when it does and tries to connect, it goes on "waiting for connection" for a few minutes and refreshes the network list itself. I know it's not the laptop because I have tried with my PSP's wireless connection and I have failed to get a connection or detection. I also attempted this with my other laptop. These computers are all within 20 feet of each other, and have worked fine for a long time, I see no reason why they would suddenly not work. My only deduction is that there is a problem with the router sending and receiving wireless signals. My router is a Linksys WRT54GS v.2.1 with SpeedBooster. I hope to fix this and welcome all your help. thank you very much.
EDIT: A hardwired connection to my desktops work fine. That's how I'm writing this.

From your desktop computer,

Open your Command Prompt
enter: ipconfig /all

Look for DNS Servers
These are your Routers IP addresses
One address will be different. That is your Internet or WAN side.
The other IP addresses will be the address of your computers.

Try using the ping command to test the paths.

what do you mean by different? Different from what?

Example:
192.168.11.0
168.125.62.1
168.125.62.2

You see the IP address that is different?
Yes...192.168.11.0 is different from the other two.
The 168 addresses are on the Lan side and the 192 address in on the WAN side.

ok mines is a bit weird, it only has two addresses on the DNS server list, so I don't know which is differnt.
It says like 68.238.64.12 and 68.238.96.12

I'm assuming your two Laptops are connected to the same router. Apparently, you don't have a WAN side connected to your router. It's just connecting the two computers together. Is that correct?

If you type "ipconfig /all" from both computers, do you get the same IP addresses from both computers?