Internet connection available but cannot browse

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Hello, just two weeks ago after cleaning viruses in my laptop, internet explorer became blank, but chrome is gunctioning, when I connect using my 3g it shows connected but cannot browse, always showing in my windows 8 pro that page not available. I unstall the 3g and reinstall but still not working, I tried to go to control panel and diagnose the problem, but to no avail what must I do