Did you try pinging....try this
Go to command prompt and type "ipconfig" and press enter without quotes
look at the default gateway it whould be somehting like this 192.168.0.1
Type : ping 192.168.0.1
command will ping 4 times. If you get all 4 replies then you have a good connection between ur router and wireless card.
next you ping outside the router
type: ping www.dell.com
see if you get any replies. If not then the problem is within OS
do the following
What is managing ur wireless conenction...Intel proset or Windows?...
If intel proset then launch the program and find and option in one of the menu that says let windows manage the wireless connection.
then right click on the wireless Icon and click on open network connection.
then in that wondow right click on wireless network connection and click on properties
There under genetal tab select Internet Protocol (TCP/IP) and then click on propertied.
ther eunder general tab make sure that the Obtain IP address automatically and Ibtain DNS server automatically are selected.
Also make sure that you are using IPV4 and not IPV6. IPV6 is just a pain right now.
Next click on start->Run and type in services.msc and click ok
in the window that poped up scroll all the way down and the 3rd last option would be Wireless zero configuration. Right click it and click on restart. Five it couple of minutes. then click on start run and type in the followijng 3 commands.
netsh int ip reset log.txt
netsh winsock reset
Each command in seperate run window and follow the sequence
After second command restart the system. Try to connect again.
Also things to consider is Encryption set on router for wireless access. Do you have corect encription keys...WEP WPA WPA2 etc. Another thing is MAC address filtering....
If none of this works...possibly ur wireless card is messed up.