Hello Jakkrid Muaydee
Windows 7 has been out of support since January 2020, so Microsoft no longer provides updates or consumer activation services. If your system was originally licensed with a valid Windows 7 product key, you can still activate by entering that key under Control Panel > System > “Activate Windows” or by running slui.exe 3. For OEM devices, reinstalling with the original recovery media usually triggers automatic activation via the BIOS marker. If you are using Windows 7 Professional or Enterprise, activation requires a valid volume license key from Microsoft Volume Licensing. If you don’t have the original key, you must contact Microsoft or your licensing provider to obtain proper activation. There is no supported workaround to bypass activation, and third‑party tools or cracks are unsafe and against Microsoft policy. If the system was previously activated, you can check current license status with slmgr /dli or slmgr /xpr. For machinery that requires Windows 7, confirm with the vendor if they provide a pre‑configured image or guidance. Because Windows 7 no longer receives security updates, it is best practice to isolate the system from the internet. This reduces risk while still allowing the machinery to function.
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Harry.