Wireless isn't working?!

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Honorable
Sep 2, 2013
2
0
10,510
I just got a new second-hand computer that was rebooted to Windows 7 and it won't let me connect to the internet through wireless. It only lets you go online by using the yellow cable that connects to the wireless modem to the computer's hard-drive. Please help? Is there a software/hardware or installment I need to install?