windows 8 activation after clean install does not accept product key

GeoffWoods asked on

Dear all,

I had a dual boot system with windows 8 and Ubuntu and tried to remove the Ubuntu but the computer did not boot, I was trying to fix the mbr and got it wrong.

I then did a clean install of windows 8 but it will not accept my product key. Before the clean install I formatted the hard disk.

Is there anything I can do or do I need to purchase another windows 8 pro?




Geoff Woods

13 people had this question

Abuse history

The answered status icon Answer
Sanwin2 replied on
Unless you bought the System Builder DVD version of Win 8, you bought an upgrade.

You need to install the OS you upgraded from and then re-upgrade using your Win 8 installer and PK.
The more people I meet, the more I like my dog.
MCC 2011, 2015, 2017
2 people found this helpful

Abuse history

Most Helpful Reply
nobody611 replied on

You need to buy another Windows 8 Pro from Amazon as you use Ubuntu, which cannot upgrade to Windows. There is an unofficial, possibly illegal way to using an upgrade product key with a clean install, but I don't recommend it. The link is at


1. Run the registry editor (regedit)
2. Find the following key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Setup\OOBE
3. Change the value for 'MediaBootInstall' from 1 to 0
4. Open an elevated command prompt (run as admin)
5. Run the following command: slmgr -rearm
6. Reboot

Now you can activate.

23 people found this helpful

Abuse history