Wifi computer help! :D?

We have a computer and a laptop which uses wifi BEFORE.


Now, were only using our computer for internet and its internet is connected with a cord.





If we want to use the laptop with the net, we need to hook up a cord to it for it to be able to be connected to the net.





BUT FOUR MONTHS AGO, our wifi was really in a good shape, we can use our laptop anywhere in our house with the WIFI.





HOW COME ITS NOT WORKING NOW?


are there any setting that we need to change or programs that we need to download to fix this problem?


Im really having a hard time figuring this out.





THANK YOU FOR THE HELP! :)Wifi computer help! :D?
I would re-run the setup disk that came with your router if you are not familiar with how to manually set up a router. I assume you have already unplugged the router for at least 45 seconds to power cycle it...if not, you should do that first.Wifi computer help! :D?
Connect Modem [wired] to Router [wireless] to PC.


=


* DO NOT REMOVE POWER TO RESET NETWORK DEVICES *


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Set router POWER OFF.


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Reset modem: With a straightened paperclip, press RESET button momentarily.


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Wait 60 secs.


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Set router POWER ON.


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Reset router: With a straightened paperclip, press RESET button momentarily.


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Wait 60 secs.


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PC Command Line:


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Click [Start] - Click [Run...] - enter: cmd, Click [OK]


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At the prompt (c:\.....%26gt;) enter: ipconfig /release, press [ENTER]


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At the prompt (c:\.....%26gt;) enter: ipconfig /renew, press [ENTER]


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TEST: Open Web Browser: Connect to Internet.


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If SUCCESS: Repeat Steps after PC Command Line on other PCs.


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If NO SUCCESS:


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At the prompt (c:\.....%26gt;) enter: ipconfig /all, press [ENTER]


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Ensure DHCP Enabled == YES


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If IP Address == 0.0.0.0 OR 169.254.0.0 to 169.254.255.255, connect Modem [wired] to Router [wired] to PC and perform ALL steps again.


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unistall all your router software and reinstall it. do a firmware upgrade on your routers manufacutere website. also i would update your drivers.