To help us to help you and to properly get answers to your post you should include some minimum information.
1. Device type. ie Desktop, Laptop, Tablet, Surface, Phone
2. Who made it and model, HDD size. If home built what type motherboard, Intel, AMD
3. OS type, Home, Pro, Enterprise, etc
4. Current build. Hit the WIN key, type winver, hit Enter.
To check if your computer is activated;
Right click Start, click Command Prompt(Admin)
enter slmgr /xpr Then hit the Enter key
It will tell you when it expires.