Hello, I currently have 2 PC, one with Window 8.1 (A HP 2000 laptop) and one with window 8 enterprise 90days trial (A custom made tower). My 90days trial is about to expire and I would like to get the key of my laptop, I already got it but I don't know how to deactivate. Also, when I try to enter the key on my tower it say ''The product key doesnt work on this operating system (Window Enterprise) you need to execute the installation program of window 8 or enter a Window 8 enterprise key'' How do I get the installation program of windows 8? Will I loose my current file? Thanks.