Windows 10: Unable to activate Windows

I used Boot Camp assistant to install windows on my mac. After it was installed, I used a windows key I had bought to active it. Then, I downloaded some updates for windows. After the updates were completed, windows became inactivated again. I tried reactivating it with my same key, but it says that the key was already used on a different machine. I also tried the activation troubleshooting, to no avail.




***Modified title from: Windows Activation***

:)

 

Unable to Activate Win 8

I was about to suggest run CMD as Admin and then do a "slmgr -ipk xxxx-xxxx-xxxx-xxxx" activation...does anyone know if that works with win8?

 

Unable to Activate Win 8

I got Win 8 isntalled on my file server, but I am unable to activate it with the key. Says the key is invalid. Since I work at microsoft I got a retail version from the employee store. I have been doing some reading, and to be able to activate Win8 with the key there needs to be a previous version of Windows installed for it to work. WTF, so you can't do clean installs?

And the box says nothing about Upgrade version. Straight Windows 8 Pro.

 

windows xp installation and dual core am

could someone please list the steps they follow to install windows with a dual core processor and windows xp service pack to. I'm reletively new to amd dual core and i feel i'm missing a step. All help will be appreciated. thanx