Windows 10: Activation Error 0xC004FC03 product key used on another device. PC locked up. Phone number...

KathrynKress · Feb 22, 2020

Activation Error 0xC004FC03 product key used on another device. PC locked up. Phone number does not respond.

:)

Ben Voigt · Feb 22, 2020

Is it possible to use a Windows 10 product key to activate a Windows 7 installation?

According to Microsoft, you can't use your Windows 10 keys. You will have to call Activation Support, provide proof that you have a license with downgrade rights, and they will provide a response to the activation challenge that will result in a one-time activation of an install.

The downgrade process

Follow these steps to downgrade to an earlier version of Windows software:

Use genuine Windows media and a corresponding product key for the version of Windows that is eligible for downgrade. The media/key should come from a previously licensed product from the OEM or retail channel.

End users who are licensed separately through Microsoft Volume Licensing (VL) may provide their VL media and key to a system builder to facilitate the downgrade on their own systems.

Insert the downgrade-eligible version of Windows media and follow the installation instructions.

Enter the product key.

If the software was previously activated, it cannot be activated online. In this case, the appropriate local Activation Support phone number will be displayed. Call the number and explain the circumstances. When it is determined that the end user has an eligible Windows license, the customer service representative will provide a single-use activation code to activate the software. Please note that Microsoft does not provide a full product key in this scenario.

Activate the software.

Click to expand...

Source: Device Partner Center

BlackOmega · Feb 22, 2020

Microsofts Activation services phone #?

So I had an old rig that was running a RETAIL version of Win XP Home. Well the thing died. I want to use the product key from that old machine to do a win 7 upgrade, however, I cannot seem to find Microsoft's support number anywhere on their site, instead it redirects me to a page and here's what it says:

To start the Product Activation Wizard:

Click Start.
Click All Programs, and then click Accessories.
Click System Tools.
Click Activate Windows.

In the Product Activation Wizard, follow these steps:

Click Use the automated phone system to activate.
Click the drop-down menu, select the nearest location to you, and then click Next.
The Microsoft Product Activation Center phone number is displayed at the top of the window.
Click to expand...

Well guess freakin what, THE COMPUTER IS DEAD, THEREFORE I CAN NOT DO ANY OF THOSE DAMN THINGS!!!!!!! *Bang Head :banghead:

This is seriously getting on my nerves!

Even googling it takes me to the same place. Does anyone have the number for their "Activation services" department?

RK1997 · Feb 22, 2020

Using the current device's product key on my another device.

On old PC:
Uninstall retail product key:

Disable secure boot(if turned on in BIOS)

Boot into Windows

Enter slmgr /upk and wait for this to complete. This will uninstall the current product key from Windows and put it into an unlicensed state.

Enter slmgr /cpky and wait for this to complete. This will remove the product key from the registry if it's still there.

Restart

Wait a little while and then use the retail key on the new machine.

Set up secure boot(recommended)

Your old machine should go back to home, or you might need to do a clean install, I'm not sure there.
Click to expand...

Hello,
I tried this before. On newer PC, activation was unsuccessful.

Windows 10: Activation Error 0xC004FC03 product key used on another device. PC locked up. Phone number...

Activation Error 0xC004FC03 product key used on another device. PC locked up. Phone number...

Activation Error 0xC004FC03 product key used on another device. PC locked up. Phone number...

Activation Error 0xC004FC03 product key used on another device. PC locked up. Phone number...

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