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disable windows on old hdd

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Posted · Original PosterOP

Hey guys,


I'm struggling here.

I built a new pc for my boss, but I can't use his windows license key.
He used to have only one hdd with windows installed. I put a m.2 ssd in his new pc and installed windows, but windows says the key is already being used.


Do I have to deactivate the key on his old hdd? Windows is still installed on the hdd, but I couldn't seem to boot to the hdd in the bios settings.

Not sure what's happening, would really appreciate some help!




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You shouldn't need to deactivate Windows on the old hdd. Try calling Microsoft and activating Windows over the phone.

If you ever need help with a build, read the following before posting: /main/topic/3061-build-plan-thread-recommendations-please-read-before-posting/
Also, make sure to quote a post or tag a member when replying or else they won't get a notification that you replied to them.

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Windows 10? If he has a Microsoft account it should be a simple matter of logging in and done. Otherwise contact Microsoft through chat or phone to have them reactivate Windows.

Crystal: CPU: i7 7700K | Motherboard: Asus ROG Strix Z270F | RAM: GSkill 16 [email protected] | GPU: Nvidia GTX 1080 Ti FE | Case: Corsair Crystal 570X (black) | Storage: 250 GB Crucial BX100 SSD + 2 TB Seagate HDD + 1TB WD Green + 3TB WD Red | PSU: EVGA Supernova G2 1000W | Monitor: Asus VG248QE 24"

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Posted · Original PosterOP

@WoodenMarker @tikker I called microsoft support and some 60 year old lady helped me through the process.

I gave her my key and she gave me another one. 


It works now, thanks a bunch!

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