Unable to connect to WIFI/Install wifi adapter to Win7

[Microsoft Windows]

I am using a HPDV6 Pavillion with Win 7 ultimate SP1 , where i am unable to connect to wifi internally and also externally with a TPlink WIFI adapter AC 600. I KEEP GETTING THE ERROR WINDOWS WAS UNABLE TO CONNECT. it has RALINK 3090 in it. please help. thanks in anticipation.

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