Find the failed step
For “Windows is not activated,” an activation error code, or activation that failed after a hardware change. Confirm how this PC is licensed, then see a sourced next step.
Separate subscription, one-time purchase, volume licensing, and preinstalled copies. Then use the message you actually see to tell an account problem from a product key problem or an organization licensing problem.
For organization devices and IT administrators: check whether the client has a KMS host configured, whether the network can reach it, and whether you have permission. It also makes clear which parts only the organization can handle.
If it is unclear whether this is Windows or Office, or the message went by too fast, look up the error code or start from the common cases.
The first version uses fixed rules. Each answer is matched against conditions written in advance, and a conclusion appears only when they match. When nothing matches, the page says the information is not enough. It does not guess.
Confirmed means direct evidence. Supported means several observations point to the same cause. Not yet confirmed means a key fact is still missing. This site does not show a percentage.
Answers are written only into the address of this page. They are not uploaded. Copy the link, or close the page and start again.