Upgraded from Windows 7 to W 10, why do I keep having to enter my WiFi password?

[WPCentral Question]

Upgraded from Windows 7 to W 10 I keep having to enter my WiFi password.

Windows 7 Pro worked fine and wifi set up was straight forward. I cannot find a way to make windows 10 connect automatically to the only wifi network available. I keep having to input wifi password again and it will work for 15 mins and disconnect