Hi. i have a bit Problem in windows updating 8.1 through store. the error show in me that **  you need to use an account with administration privileges to install windows 8.1, try longing in with the user account of administrator of this PC and trying the update again.**

but i am using just administrator account user.

 so please help me regarding this issue thanks.

Hi Awais,

In this thread is a solution that has worked for several people.

HStar123 wrote:

Try this it worked for me

First, find where all the updates for windows are listed.  Go to Control Panel ---> Programs.  Then under Programs and Features, you'll see a link called "View Installed Updates".  Under Microsoft Windows, scroll until you find KB2871389.  Uninstall it, and then accept the prompt to reboot your computer.

Now, login under your account (that has admin privileges) and then go to the corner until the floating menu comes up and choose settings.  From settings choose change PC settings at the bottom.  Then, click on "windows update" at the bottom of the right hand side of your screen.  Check for updates now and it will take a few minutes, but they will find one (KB2871389).  There is a message telling you that it will download automatically in a few days, but ignore that, click on the link for one important update, and choose install now (or some such thing). 
Log in on an admin account, go to the store, choose the 8.1 update, and now, no admin problems.

Hop this helps,

David
Windows Outreach Team - IT Pro
The Springboard Series on TechNet

From settings choose change PC settings at the bottom.  Then, click on "windows update" after this 

2 important updates are available.

1 intel corporation storage controller intel (R) 7 series chipset family SATA AHCI controller

2 update for windows 8 for *64 based systems(KB2871389)

i have to install this KB2871389 update or not?

Yes. KB2871389 needs to be installed. The other thread that I linked, people had this update installed and were receiving the same error that you were. For some, uninstalling this update, rebooting, and reinstalling the update fixed the issue.

Hope this helps,

David
Windows Outreach Team - IT Pro

thanks alot, its working.