Wireless internet not working at my house when I use my laptop (using a linksys wrt54g2 router)

I am using a laptop for wireless internet (Dell D610). I have no problem using wireless internet at my school and in other places, but at my house, I can’t browse the internet. The router at my house has a strong signal (4 or 5 bars) and when I try to connect to it, it says that I am connected, but when I open up the internet browser, I can’t get online. The router is in a room right next to mine and it is on the same floor. It is a Linksys WRT54G2 router.
When I go to the network connections folder, for the wireless network connection icon, it says “not connected, firewalled.” I can still browse the internet, though (at places other than my house).
Another thing that I want to mention- I can't connect to other routers in the neighborhood either (the ones that aren't secured). It just doesn't connect (but for the router in my house, it connects). But my roommate told me that a bunch of people have connected to this one guy's router.
What is the problem here? What can I do to make the internet work? Why would I be able to access the school's wireless internet and not the one in my house?

Whats the Wireless Settings you have set on your Router, I there might be the possibility that you have set the security mode on your Router too high thats the reason you are not getting connected to your Wireless Network. Follow the setps to change the Wireless settings on your Router and i think this might help in getting you connected to your wireless network.
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 neighbours 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 the Sub tab, Wireless MAC Filter..
Make sure the Wireless MAC Filter on your Router is Turned Off.
Click on Advanced Wireless Settings
Change the Beacon Interval to 75 >>Change the Fragmentation Threshold to 2304, Change the RTS Threshold to 2304 >>Click on "Save Settings"...
Now see if you can locate your Wireless Network and attempt to connect...

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