A few weeks ago, our old router gave out, so we bought a new one. Our computer guy came out and hooked it up and left because it appeared to have successfully worked, connection our two computers. The internet said 'connected' at first, but shortly, it read 'not connected' with the red "x" and everything. It was still reading full "excellent" signal from the network, but was still "not connected". If I hit 'repair' it would run though, then say it was unable to repair. However, while it still read that my internet was "not connected", it would actually work just fine as if it was connected properly. It works for about 20 minutes until a notice pops up saying "unable to connect to wireless network". I can use the internet so long as I constantly repair the connection when, all the while, I'm still "not connected" I'm not sure why its doing this or how to fix it so I can have constant internet access without this pain. I've tried several things, such as trying different usb ports, checking my network password, etc. I'm not sure if the problem is with the modem and router hook up on the main computer, or if its on the receiving end with this computer. Any suggestions would be excellent!
Try unplugging both the modem and the router. count to 15 then plug back in and try.
Keep in mind also that some routers dont connect 100% till you open a browser, weird but I have had similar problems.
It sounds like you may have problems at both ends.
Several things come to my mind;
make sure you shut down ALL programs in the background.
you are trying to problem solve by elimination, so close anything that may connect to the internet and take away that variable.
scan for spyware etc.
do a registry clean, temp files cleanup etc.
sometimes restarting the pc can help
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Most of the newer routers use a newer type of encryption (WPA or WPA2) which is not supported by older 802.11b hardware.
Either set the Linksys router to use WEP encryption, or get a newer 802.11g card for the old laptop which can use WPA or WPA2 encryption.
Older versions of Windows XP also need to be upgraded to Service Pack 3 or apply this patch: http://www.microsoft.com/downloads/en/details.aspx?FamilyID=662bb74d-e7c1-48d6-95ee-1459234f4483&displaylang=en
I would just unplug everything from the modem and the router and plug it all back in after a few mins. If the router doesnt have a light on the numbers 1,2,3, or 4 then you need to connect the router to the modem with a phone cord (Linksys usually comes with a blue one) then make sure you have a phone cord in the router going to your computer. That should turn a flashing light on one of the four ports (1,2,3, or 4). If you have a light on any of those numbers then your router is hooked up to the modem correctly and the connection itself is the problem. That means you have to play with the network settings on your computer.
See if you can hook an ethernet cable up between your computer and the Linksys. Then give it a few minutes and go to a command prompt and type ipconfig you will see the black screen display your ip address and so you can write down the gateway address. Now in a broswer, type the ip address. It will look something like this http://192.168.0.1 and you should see a configuration menu pop up. Hope this helps
trying updating the firmware of the wireless router...go to this link and just search for the version and download the latest version of your linksys router and then upgrade the firmware...
it shud work.........also try changing the channel number as well....... http://www.linksysbycisco.com/US/en/support/WRT54G/download
heres what you should do, 1. reset the router from the liitle reset button on the back of router. 2. hook up the laptop wired into the router to set up your network from scratch. 3. write down all admin/wireless settings pertaining to security. 4. after you have all settings set right, reboot the router. 5. reboot all pc's on your LAN/WLAN, and if all planets are in alignment they will all be assigned an address by dhcp and you will be happy.
I noticed you said you had an wrt-54gs, if you have version 1, 2, 3, or 4 then you might be interested in turning that router into a super router. check out this link http://www.dd-wrt.com - wiki here - http://www.dd-wrt.com/wiki/index.php?title=DD-WRT_Docu_(EN)
this is firmware that is like steroids for your router. Hope this helps.