Basically we use our Windows Store account for Installing Apps from Windows Store in Windows 8 Operating System . Whenever we install Apps from Windows Store in any PC, the name of that PC will be added in our Windows Store account. We can install Apps on five different PCs using our Account, after that if we want to install Apps on some another PC, then we have to remove one of those PCs from our Windows Store Account to Install Apps on another PC. So Just follow the below given Steps for Removing a PC from your Windows Store Account in Windows 8.
1 - First open the Windows Store by clicking on the Store from Start Screen.
2 - Sign In to the windows Store by using your Microsoft Account.
3 - Swipe from the right side of the screen and select the Settings charm.
4 – Click on the your Account under Settings.
5 - Now Under you PCs Click on Remove below to the PC you want to remove from your account.
6 - Now you are asked to Confirm, Click on Confirm.
Note - You won’t be able to use any of the apps you installed from the Windows Store on Removed PC.