I bought a Toshiba L755 satellite laptop quite some years ago it has not been used for a long time. I am trying to activate windows 10 on it . The activation code came with the laptop when I bought it in Kissimmee Florida a long time ago .

Peter Baxendale 0 Reputation points
2026-10-28T19:19:44.8733333+00:00

I bought a Toshiba laptop in Kissimmee Florida a long time ago. I have put windows 10 on the laptop but Microsoft will not Activate it. THE COA is the same one that I got with the three discs for Windows 10 Pro when I bought the laptop.

Would you please help me sort this out as I can not afford to go buying more products to get my laptop to run right.

Windows for home | Windows 10 | Licensing and activation
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  1. Ian-T 15,605 Reputation points Microsoft External Staff Moderator
    2026-10-29T01:28:42.8733333+00:00

    Hi @Peter Baxendale

    I understand you want to reuse the license that originally came with the laptop rather than purchase Windows again.

    First, please check Settings > Update & Security > Activation and confirm:

    • Which edition is installed: Windows 10 Home or Windows 10 Pro
    • The exact activation error code shown

    The installed edition must match the edition covered by the product key. If the COA is for another Windows edition, it will not activate Windows 10 Pro.

    If it does say Windows 10 Pro, select Change product key and carefully enter the 25-character key from the COA or packaging. You can also run Troubleshoot on the Activation page while connected to the Internet.

    Please do not post the product key publicly. Reply only with the Windows edition stated on the COA and the activation error code.

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  2. Neil D 34,660 Reputation points Volunteer Moderator
    2026-10-29T09:00:50.9133333+00:00

    The free upgrade period was 2015 to 2016 and has ended.

    Microsoft will not let users activate windows 10 using a Windows 7/8 licence the licences are blocked.

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