Connection to wireless unsuccessful?

I have changed routers, I have changed my Wi-Fi network adapter, I can't manage making it work, no matter what network I connect to I get connection unsuccessful and limited connectivity, but my iPhone connects to my Wi-Fi. So I don't know.

Have you tried resetting your router?
maybe you have the wireless network saved under the wrong key password
try deleting it (or forgetting it on your desktop)

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