Unable to connect to wireless after upgrading to Windows 8.1 from 8

First just try changing the settings manually from the command prompt:

netsh wlan set profileparameter name=nameofnetworkprofile authentication=WPA2PSK encryption=tkip

Otherwise, you will have remove the profile and recreate it:

1. Go to command line, preferably Administrator (have not tried without).

2. C:\Windows\System32> cd \Users\<User>\Documents

3. C:\Users\<User>\Documents> netsh

4. netsh> wlan

5. netsh wlan> show profiles

6. delete profile name="<yournetwork>"

   • Enclose the name of network within quotes, this is to ensure that you can cleanly set up the right profile. Don't close the netsh, we'll need it some more. If you do, just reach there the same way as before.
     

7. Right click the connection icon in lower right corner > open Network and Sharing Center > Set up a new connection or network > Manually connect to a wireless network

8. Try to create a profile, and try to get as many details to correspond with your requirement. The rest we will edit on the command line, so let's make it as easy as possible.

9. Do the same at the next screen. Edit Network settings > change all the parameters that you can, to match your environment.

10. Finish. Move back to your netsh terminal

11. netsh wlan> show profile <profilename>

    • Without quotes this time. This should show your previous attempt at creating a profile in the GUI dialog boxes. In my case, it had WPA2 and AES. It has to become WPA and TKIP. I also set my authMode to userOnly, since I hadn't done it right in the dialog box before.

12. netsh wlan> set profileparameter

    • Displays a humongous list of parameters with detailed options, just carefully examine the syntax. It's all here.

13. netsh wlan> set profileparameter name=<profilename> authentication=wpa encryption=tkip authMode=userOnly

14. netsh wlan> set profileparameter

    • Don't exit this yet.

15. Now click the connection icon, and connect to the network. It will ask you the username and password in a different style, that was my clue something was different this time.

16. It should connect. In my case, at least, it did. Verify by browsing.

17. netsh wlan> export profile name="<profile name>"

    • In order that you're not put through this ordeal again, export the profile safely to a file. Again, the profile name in quotes.

ref: http://en.community.dell.com/support-forums/network-internet-wireless/f/3324/t/19528910.aspx

ref: http://www.tomshardware.co.uk/answers/id-1849258/aes-tkip.html

ref: https://social.technet.microsoft.com/Forums/en-US/290c63b4-ce04-4483-a047-e1000c7d7699/wpa-security-types-are-missing-after-upgrading-to-windows-81?forum=w8itpronetworking