Bought one very recently, the options are

• buy a prebuilt and it will come with windows pre-installed
• buy a DIY edition and the SSD will be new in box with nothing installed on it
  • you can opt for a windows license, but it is just a digital download for the installer

…working at the Southern University of Science and Technology (SUSTech) in Shenzhen, China…

Ollama isn’t a model, it’s a piece of software used for running various models