I have a Sony VAIO SVF15N17SNS or in other markets its known as SVF15N17CXB model that came with Windows 8 Single Language Pre -Installed.I upgraded it to Windows 8.1 Single language from Windows Store and there was no need to activate windows it took the windows 8 product key automatically.
Things were fine for long but few days back I noticed that my C: (OS) partition is growing daily with no obvious reasons. I tried to Rest/Refresh the Windows from PC Settings but it failed saying some files are missing and I need a installation media that I didn't have.
I followed one of the articles on web saying if everything fails then download Windows 8.1 Enterprise Evaliation ISO and restore the recovery of Windows. I did that and was able to Refresh my PC.
Now after refresh its no more Windows 8 but Windows 8.1 Enterprise that needs activation. I do not have any recovery disk or product key of Windows 8.
Kindly help me to go back to my original OS Windows 8.