My Asus laptop worked fine for over a yr. Out of the blue it won't connect to Wi-Fi..My wifes laptop works as does her cell phone.Trouble shoot says I don't have a vaild IP configuration.Yet the laptop may connect once a day and once you shut it down, it doesn't work anymore..I have a TP Link AC 1750 router..I'm computer illiterate..Can someone pls walk me thru this...Thanx 
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