Had dual boot...c,d problems with 7 on c.and had to reinstall , after 10 wouldn't boot , says signature files missing?? burned anew install disc for 10 ,using media tool and tried to fix using tools on disc...no good.restore useless , then tried to keep settings and reinstall...that failed also......then tried EasyBcd to pinpoint drive for boot...that didn't work either! Hum ....ran out of ideas !!!.....P.S Question! If I do a clean install of 10 final ,will my Insider generic key still activate the OS , for use???