A while back, I changed the internal drive in my laptop and restored Windows 8 using the recovery tools on the installation DVD. After reboot, windows was still activated and everything was working fine. Then I resized and moved the partition on the same new drive and activation was still ok. I just tried a slmgr.vbs /ato and Windows got de-activated! Edit: Tried re-activating but failed with an error code, then tried phone activation, got a confirmation id but when I clicked next in the activation wizard it said not genuine. I had to restore a backup of my data.dat file from Linux and my activation came back. Is this normal? I am using Windows 8 Professional x86 and added the free Media center Pack.