how to activate windows 8 pro?


  • my windows 8 pro it was active first time wen I install it and then I change the hard drive and install it.

    Now it won't active can you help me please. 

    Sunday, August 19, 2012 11:32 PM


All replies

  • Have you tried to reactivate by phone?  Not sure if this is available yet or not.  You could also try to use the slui.exe 3 option in the run dialogue box.
    Monday, August 20, 2012 2:50 AM
  • From an admin command prompt type:


    Monday, August 20, 2012 9:53 AM
  • Thanks Systems_UK! My Windows 8 was not activating in the proper method (with the GUI). Your command worked first try, thanks!
    Thursday, August 23, 2012 4:19 AM
  • Dear

    when I ran this command it showed an error

    "Error:0xC004F050 The Software Licensing Service reported that the product key is invalid"

    let me update you that I was using Window 8 Preview that I got activated successfully. Then I installed Win 8 Pro on the same partition after formatting.


    Monday, August 27, 2012 8:38 AM
  • In SEARCH enter sliu.exe 0x3 = opens an activation window that allows you to enter a full activation key
    Thursday, July 25, 2013 5:23 PM