I can connect to router but not to internet after setting up a lan

A friend of mine recently attempted to set up a Lan connection between mine and his own computer for gaming however after we disconnected our computers I cannot connect to the internet over my wireless router. The computer still connects to the router but not to the internet and the other computers in the house are having no problem connecting to the internet wirelessly so I know it has to be my computer
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  1. Did you use a different password on your computer to connect it to your friend's computer?
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Configuration Connection LAN Internet Wireless Networking