When I bought my used Iphone, I could not use it until the original owner released it through Icloud security, Now I have bought a used laptop with Window 8.1 and when I try to get into the App store I am asked to login as the original owner. Appears my Windows 8.1 is also not being updated as I am not the original owner.  I created an Account.live.com account but it is not attached to my laptop.

How do I get my computer attached to the Microsoft system for updates and usage of the App Store. Likewise my Mail application wants to access Outlook.com which expects the same as the old owner.