PC doesn't find my Wi-fi

This worked for me and maybe it'll work for you. I simply unplugged the Wi-fi, waited for about a minute, then plugged it back. I can now see my Wi-fi.

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Tweaking Wireless Connection

Set the "Throughput Enhancement" from Disabled to Enabled (switch back if sharing wireless and don't want to be a bandwidth hog... :) Instructions here:

SOURCE: http://www.makeuseof.com/tag/how-to-troubleshoot-weak-wireless-connections/