Why wont my lgk7 factory reset

My phone will not factory reset...i rooted then was having trouble out of king root so i was in process of changing it over to kingo root and super su...evidently i opened a file meant for windoes n the phone crashed..didnt get stuck in boot loop but it will power up and then it moves slowly for a minute or two til it finally freezes.so i go to factory reset and it goes thru the motions but comes back on not reset ..i try to hard reset it fron the volume up key and power i get the factory reset screen but when i touch yes it just simply cuts my phone back on.what have i done??how do i fix it...i love my k7 its so user friendly.