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If you’ve checked the serial number on your notebook and noticed it didn’t come with Microsoft Office or even Windows pre-installed, don’t worry—you’re not alone. It looks like your device originally came with FreeDOS, which means there’s no operating system or office suite included right out of the box.
First, let’s identify what you have. According to the parts list for your notebook, the motherboard has the part number N40866-001, and this particular version doesn’t have a Windows product key embedded in the BIOS. Typically, models that come with Windows and 8GB of memory will have a different part number, like N40866-601.
Before installing Windows, it’s a good idea to have the product key ready, just in case you need it later. You can use a free app called Showkey Plus, which is available for download from the Microsoft Store. It will show you the product key currently installed on your system, making reinstallation easier if you ever need to do it in the future.
To get Showkey Plus, visit this link: ShowKeyPlus – Free download and install on Windows | Microsoft Store. Once downloaded and installed, run the app and note down the product key it displays.
Based on your notebook’s serial number and the parts list, your model is likely the HP 255 G10 B15J0PT. It’s a budget-friendly laptop with an AMD Ryzen 5 7520U processor, 8GB of RAM, and a 512GB SSD, but it originally came with no operating system installed—hence the FreeDOS.
Now, to get your notebook up and running with Windows:
- Download the Windows installation media from the official Microsoft website using their media creation tool.
- Create a bootable USB drive with the Windows installation files.
- Insert the USB into your notebook and restart it. You may need to press a specific key (like F9, F12, or ESC) during startup to access the boot menu.
- Select the USB drive to boot from and follow the on-screen instructions to install Windows.
- When prompted for a product key, you can either enter the key you saved from Showkey Plus or skip this step if you plan to activate Windows later (you may need to connect to the internet during installation).
Once Windows is installed, you can download and install your preferred Office suite or use free alternatives like Microsoft’s Office Online or LibreOffice for word processing, spreadsheets, and presentations.
This way, you’ll have a fully functional laptop ready to use. If you need more help or run into issues during installation, don’t hesitate to seek additional support.



