WRT120N no longer recognized by laptops

I'm not quite sure where the problem lies, so I'm going to go over everything that happened so I can hopefully get an answer. Any help is MUCH appreciated.
We were running a few laptops (Acer Aspire 5517 on Vista) off our WRT120N router wirelessly. We have it hooked up to a wireless modem. All signs show that the modem and router are running fine. The wireless network we were using, I'll call it Network-1, stopped showing up as an option in the wireless connect menu. Prior to this all the laptops could connect to Network-1 by wire or wirelessly without a problem. I don't know what happened to start the problem, but Network-1 is no longer a wireless network option.
When I wire a laptop to the router, it connects to the internet and says it's currently connected to Network-1. But when I try to connect the wireless network via a wired connection, the new network I set doesn't show up in the connection menu. When I try to set up the router again (while the computer is wired), I get the error message "Windows did not detect any wireless network hardware". So it seems that although I am able to get an internet connection through the router, the computer is not recognizing it.
One of the laptops is able to connect wirelessly through a different network (Network-2). It looks like Network-2 was set up automatically by the laptop. Another laptop has Network-2 as an option, but it says the network security key is wrong. I have no idea what the password might be, the computer where Network-2 works connects automatically, I haven't had to type a password. I'm not sure what happened here, if it's two different connections with the same name, or if it's the same thing. I don't even know if this is relevant.
Again, we would be SO grateful for any help!
Solved!
Go to Solution.

Well i think due to some reason the wireless settings of your Router must have got resetted, that's the reason you are unable to see your wireless network name. So you need to Hardwired you computer to the Router and login to the router setup page and change the wireless settings of your Router.
Open an Internet Explorer browser page on your wired computer(desktop).In the address bar type - 192.168.1.1 and press Enter...Leave Username blank & in Password use admin in lower case...
For Wireless Settings, please do the following : -
Click on the Wireless tab
- Here select manual configuration...Wireless Network mode should be mixed...
- Provide a unique name in the Wireless Network Name (SSID) box in order to differentiate your network from your neighbors network...
- Set the Radio Band to Standard-20MHz and change the Standard channel to 11-2.462GHz...Wireless SSID broadcast should be Enabled and then click on Save Settings...
Please make a note of Wireless Network Name (SSID) as this is the Network Identifier...
For Wireless Security : -
Click on the Sub tab under Wireless > Wireless Security...
Change the Wireless security mode to WPA, For Encryption, select TKIP...For Passphrase input your desired WPA Key. For example , MySecretKey , This will serve as your network key whenever you connect to your wireless network. Do NOT give this key to anyone and remember the key.
NOTE : Passphrase should be more that 8 characters...
Click on Advanced Wireless Settings
Change the Beacon Interval to 75,Change the Fragmentation Threshold to 2304,Change the RTS Threshold to 2304 and Click on Save Settings...
Now see if you can locate your Wireless Network and attempt to connect...

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