Ok I am going to jump in here if you dont mind.....
Are you using Internet Explorer to connect to the internet?
If yes download FireFox on another computer and save the file.
Get a CD/DVD writeable disk or a floppy or a USB pen drive and put FF download onto it and transfer to the computer.Install it.
Open FireFox now can you connect to the internet?
For Internet Explorer:
1.Close any Explorer or Windows Explorer windows that are currently open.
2.Open Internet Explorer by clicking the Start button, and then clicking Internet Explorer.
3.Click the Tools button, and then click Internet Options.
4.Click the Connections tab, and then click Lan Settings.
5.Make sure there is only a tick in Automatically detect settings only.
6.Close Internet Explorer, then try opening again.
If that doesn't work, try this :
1.Close any Internet Explorer or Windows Explorer windows that are currently open.
2.Open Internet Explorer by clicking the Start button, and then clicking Internet Explorer.
3.Click the Tools button, and then click Internet Options.
4.Click the Advanced tab, and then click Reset.
5.Select the Delete personal settings check box if you would like to remove browsing history, search providers, Accelerators, home pages, and InPrivate Filtering data.
6.In the Reset Internet Explorer Settings dialogue box,click Reset.
7.When Internet Explorer finishes applying default settings, click Close, and then click OK.
8.Close Internet Explorer.
Your changes will take effect the next time you open Internet Explorer.
Have you run the setup wizard for this connection?
Have you run the connection wizard?
Have you turned off your AntiVirus software and Firewall and then try to connect?
Do you see the computer on the network of the main computer the router is connected to?
Have you allowed the new Belkin adaptor to connect to the network via the main computer?
Have you installed the new Belkin adaptor and put in the routers security key etc?
When you hover over the little icon on the task bar what pops up?
Does it say Access Local and Internet or just local?
Start|run|type cmd
type ping www.google.com
Please post results.
Also a possiblity:
http://helpdeskgeek.com/networking/can-connect-to-wireless-router-but-not-to-the-internet/
Have you simply turned off the wireless router by the mains socket.
Turn off all computer/laptops/netbooks.
Turn on wireless router then turn on the netbook,now can you get a connection?
Is it possible the computer has a virus?