How can I fix a Windows 7 product key error?

[WPCentral Question]

Hi i had purchased a windows 7 key long time ago which i used on a computer of my friend but i want to remove it from there so i can use it on my pc how can i do that ?
also i tried activating my windows with my key but i get an error :|

 

[Laura Knotek]

Re: Windows 7 product key error plz help!

Please see this page. http://answers.microsoft.com/en-us/...-want-to/e492c4c7-59f6-43a3-afa0-423286adece8

Sent from my rooted Nexus 7 (2013) using Tapatalk

 

[Chriskey2015]

buy a new windows installer....