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Windows 8.1 will not activate

I have a Dell M4800 which has both a Windows 7 sticker on the palmrest and a Windows 8 Pro sticker underneath, so I had assumed it would have a Windows 8 Pro licence key in the BIOS. Having obliterated the previous partitions and installed Windows 8, the machine will not activate, and using rw everything, I see there is no MSDM tab under ACPI. Is there any way I can get licenced Windows onto this machine without going out and buying it again?

My Computer

System One

  • OS
    Windows 8.1
    Computer type
    System Manufacturer/Model
    Dell Precision M4800


VIP Member
Cape Town

That appears to be a Win 7 factory PC that was upgraded by Dell service centre - if you have a backup of the obliterated partition then we can retrieve the key from that, otherwise you are SOL.

Best then to install Win 7 and activate with the COA key - then upgrade to Win 10 for free while it still lasts?

My Computer

System One

  • OS
    PC-DOS v1.0
    Computer type
    System Manufacturer/Model
    Intel 8088, 4.77MHz
    16K, 640K max
    Graphics Card(s)
    What's that?
    Sound Card
    Not quite
    Screen Resolution
    80 X 24 text
    Hard Drives
    dual 160KB 5.25-inch disk drives

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