i had the same problem after doing everything i could and trying everything, i decided to re-image my laptop but then got the bright idea to just try a "refresh"(fixes problems or something without deleting files-resets to default settings and app-i think this is accurate)and the refresh actually worked, also solved the other problem which i had for more than 2 months-accounts disappeared, so at this point in time i think the "refresh the PC" option can help a lot.
For windows 8.1(or 8 i think) go to the start menu, swipe from right and go to settings then go to the "power" tab and click restart while holding down shift, hold down shift until you see blue screen with more options, i think after that you either just click "refresh the PC" or go into advanced options and click "refresh the PC", then let it do the magic but just for some advice i recommend making a restore point or a recovery disk just in case.
For other operating systems, i guess you could just search up "refresh PC" on google followed by your operating system(or windows edition in most cases).
I hope this can help, Zohaib
Did you checked the store it worked ....?