My HP Pavilion 2000 series laptop came with Windows 8. I upgraded to 8.1 and now just upgraded to 10. I then tried a complete wipe instead of resetting and keep my personal files. I never made a backup copy of my windows 8 and need to know how to find my product key so I can download and re-install windows 8. I do have a Boot CD but it is one I bought off of eBay and it is called "RepairOS System Fixer For All Windows Computers". Can I use this to access my computer and then to find my product key? Any suggestions?? Thanks!