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Laptop that used to connect to network with wpa2 doesn't after brief switch to wep and back to wpa2

My Samsung laptop running Windows 7 was connecting just fine to our Linksys N750 router with WPA2 encryption. This morning my boyfriend used his desktop to switch the encryption on the 2.4 Ghz signal (but not the 5 Ghz signal) to WEP so he could briefly connect an older device. When he was done, he switched the encryption back to WPA2. After that my laptop would not connect to the network.

The series of events went like this: My laptop was closed and asleep when the change was made. At some point I opened my laptop and pulled up Chrome and saw that I wasn't connected. When I pointed this out my boyfriend went to his desktop to switch the encryption back to WPA2. When I tried to re-connect, I got an error that Windows couldn't connect to the network with a link to the troubleshooter. The troubleshooter immediately failed to find a solution. It just thought about it and said no. Didn't give me any options to click through first.

I restarted my laptop and now the SSID has a red X instead of signal bars. When I expand the entry in the list of available networks it shows a message: The settings saved on this computer for the network do not match the requirements for the network.

Thanks for your help!
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More about laptop connect network wpa2 switch wep back wpa2
  1. Best answer
    Delete the existing saved network connection on your laptop, then create new one from scratch like you did the first time.

    To delete existing saved connection on Windows 7:

    Control Panel > Network & Sharing Centre
    In the left pane, click "Manage Wireless Networks".
    Click on the network name to highlight it.
    Click "Remove"

    Now go back to the main window and click "Connect to a network".
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