I have downloaded windows 8.1 installation file (15 MB). when running the installer getting this error message -  installer encountered a error 0x80080005 server execution failed My system configuration  is -  ASUS Vivobook Core i3 1.8 Ghz 64 BIT OS 4 GB RAM

Hi,

Now, you can try the following method to install windows 8:

Download Windows 8.1 Preview

http://windows.microsoft.com/en-us/windows-8/preview-download

I found the solution. It might sound strange but I dissabled file sharing in settings and post that when I tried installing the update it worked.