To disable or turn off Windows Store in Windows 8, do the following:
Step 1 : Press Windows logo + R to open the Run dialog box
Step 2 : Type gpedit.msc and press Ok
Step 3: A new window name ‘Local Group Policy Editor‘ pops up . Now you will need to go to the following directory :
User Configuration\Administrative Templates\Windows Components\Store
On the left hand panel , expand Administrative Templates , Windows Componets and then click on Store .
Step 4 : Once done , on the right hand side you’ll see “Turn off the Store application” . Double click it .
Step 5 : Once open , select ‘Enabled‘ and click Apply . Note : If you want to enable Windows Store , select ‘Disabled’ instead of ‘Enabled’.
Step 6 : Open the ‘Run’ dialog box again by pressing Windows Logo + R , type gpupdate /force and click Ok. This allows the updated policy to take effect .
Read more at http://dottech.org/135196/how-to-disable-turn-off-windows-store-windows-8/#FVM82rfLjWg3X3d8.99