I don't know about Windows activation until my laptop suddenly started showing an Activate Windows watermark. I was confused. A quick Google search led me to kms full https://anationofmoms.com/2025/03/microsoft-office-2019-home-and-business-vs-office-2021-professional-plus.html , where I learned that some laptops come with temporary activation that expires. Their site explained everything clearly, and I followed the instructions to fix it.