Big Problem! Tiles, apps and PC settings are opening and crashing. I got instructions online and following the instructions I attempted to fix the problem. I was instructed how to make some changes to the registry, which I did, but when I restarted the computer things got worse, some programs will not open but a popup store tile asking "How do you want to open this type of file? Look for an app in the store" is most present. I tried but could not get back into the registry to undo what had been done nor could I access command prompt to use sfc scannow as when I try the affore mentioned tile pop up. How can I fix this problem, I need your help.