Hi,
Try resetting your router and try connecting again. Also, it is possible that you are infected with some malware or some other program preventing you from connecting to Internet.
I suggest, first try resetting your router and than check what programs do you have running. Delete all what you don't need from Add Or Remove list, use CCleaner to clean your computer, and try again. One fast scan from antivirus should be nice to know if you are infected.
Regards
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