Your friend is able to go online using the same wireless network. that means the wireless network is working properly and there might be a problem with your computer .
You said that you can connect to the wireless network but you can not go online.
Check the IP address and the default gateway of the computer.
Try to ping the router and DNS server and check what happens.
Make sure that there is no static IP address on the computer.
Click Here for more information about the routers and Internet.
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