I'm sorry, but as far as I know, there is no such thing as Windows 13. The latest version of Windows that is currently available is Windows 10. It is possible that the people you heard about who are using Windows 13 are actually using a fake or modified version of Windows, which is not recommended as it may be unstable and could potentially harm your computer. It is important to always verify the authenticity and reliability of any software before installing it on your device.