One of my many moans about Windows Updates is that they re-enable Flash but I didn't know until today that they also affect the Search Providers.
On my new WIn10, Bing had been moved up to number 1 - Norton had been moved down the list but remained as the default.
On my older Win7-upgraded to WIn10, Bing was number 1 and was also the Default.
Something else to have to do every time there's a Windows Update. 