Another computer locked my router so my kids cant get on the internet on their laptops

There is a great article at Working with Windows Wireless Networks
If you need more help post back! Thumbs and testimonial are welcome!

in windows7
the wpa code is the network password for your windows computer network.
go to: start, control panel, network and, internet, homegroup, view or p
print home group password, then "enter" the large letters you see will be your wpa code pass word

Connect an Ethernet cable from the network port on your computer to one of the LAN ports on your router.

Start Internet Explorer.
Access the web-server inside the router: http://192.168.0.1 or http://192.168.1.1
and set a new password for your wireless network.

You will need to check the wireless settings of the router
is there any computer connected to the router ?
If yes then you can open the router set up page on that computer.
Router set up page is the page where you can check all the wireless settings of the router.

Click here for step by step instructions

Click Start
Click All Programs
Click Accessories
Click System Tools
Click System Restore

Select a "restore point" from more than 2 days ago,
and restore your computer to that point.

I think the first thing you should try to verify if the signal is strenght enough, because if it is not so the speed will be slow too.

1st.  What brand and model # of your router? 2. The router cd should be run only on the computer u have connected to the router with a network cable. Your vista laptop. Is it connected with to the router with a cable? 3. If so, it will be the one used to configure your router for wireless setup. When you ran the setup it should have gone thru Wireless Setup. It will ask you for an SSID. That is a name you will give your wirless network. It can be anything you want. just remember it.  It will also ask you to setup security for your wireless network. follow the instructions to setup a password. write it down. This is an important step so anyone cannot just logon to your wireless signal an start using ur internet connection or gain access to your computers. 4. when u setup your dongle on your kids computer it will search for wireless signals in the area. you will look for the one u setup in the previeous step. you will select it and it should ask you for the passkey you setup. once connected you will have access to the internet.
Think of your router as a private radio station and the wireless usb dongle is the radio. The only way your computers can tune to it is using the dongle and if you know the name of the station (your SSID) and the passkey.

Hi! Did you go into the router configuration through IE (Internet Explorer)?

Sounds like you are setup to use Internet Connection Sharing. don't do this. Have each computer connect to the internet via the router. If the router is wireless connect all computers wirelessly to the router that are wireless capable and any computers that are not wireless capable, connect them to the router via a cat5 cable to the cat5 ports on the router. This will solve your problem. BPCS

I can definitely help you on this, however, this would require us follow a few troubleshooting steps which cannot be dictated here. So, I would request you to initiate a chat session with me from the fixya homepage and we would carry on from there. Cheers