Wi-Fi connection issue.

[Microsoft Windows]

My Dell laptop will no longer connect to the internet via Wi-Fi. It will only connect to the internet if I hardwire it to the Modem. All other devices are connecting properly to the internet via Wi-Fi. My cable company has replaced the Modem and checked for other issues, but none have been found and replacing the Modem did not resolve the issue. How do I fix this problem?

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