Have wifi connection, but computer cannot access the internet

Hello,
i have 4 laptops and 1 pc, all laptops have wifi, but just recently one of them still has wifi connection, but will not let me go online----message this computer cannot access the internet appears, the wifi connection is there, but it does not connect when plugged into router either, have tried system restore etc but to no avail.
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More about have wifi connection computer access internet
  1. have you checked the Proxy Server settings?

    have you scanned for malware?
  2. Check TCP/IP Properties.

    Start, Connect To, Connection, Properties, Scroll Down TCP/IP and highlight, click Properties and check that Obtain DNS and IP address automatically are enabled.
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Laptops Connection WiFi and Home Networking Computers Internet Wireless Networking