Now insert your DVD into your PC, or mount the ISO File and navigate to:
Copy the install.wim file off your DVD into the Windows8Files folder we just created.
Next we need to launch and administrative command prompt, so move your mouse to the bottom left of your screen and right-click then select Command Prompt from the context menu.
Now we need to run the following command:
reagentc.exe /setosimage /path C:\Windows8Files /target C:\Windows /Index 1
Now you can refresh or reset you PC as normal, except it wont ask you to insert your DVD.
That's it.You have done it.