Have anyone else ever seen this problem before?

[saiprem]

So the problem is my OS name is missing everywhere and i think that caused my acitvation failure idk when it happened but today morning when i turned on my pc it showed that the activation is not valid for this os. (or something like that) then i checked in system proporties and found that my os name is missing. and os is not activated then i went to windows store and saw i can download 8.1?? (But i have alerdy installed 8.1)

please help me what can i do and i dont want to reinstall at any cost.

here are the pics :

[Gray]

Nope, it's just you.

[Joshcarr2006]

Download 8.1 and rename your computer?

[Raple]

Maybe it's because you installed Windows 8.done

[.VIZ]

Windows 8, ew

[HeroicXPharaoh]

Download Windows 7, 8 Sucks