There are several leading Windows workstation manufacturers, including:

Dell: Dell is a popular brand that offers a wide range of Windows workstations for different use cases, including high-performance workstations for professionals in fields such as engineering, architecture, and scientific research.

HP: HP is another well-known brand that provides a variety of Windows workstations for professionals, including desktops and mobile workstations that are optimized for different types of workloads.

Lenovo: Lenovo is a leading manufacturer of Windows workstations that offers a range of high-performance desktops and mobile workstations, including the ThinkPad and ThinkStation product lines.

MSI: MSI is a Taiwanese company that specializes in high-performance Windows workstations and gaming laptops. They offer a range of products that are popular among professionals in fields such as 3D modeling, animation, and video editing.

ASUS: ASUS is a well-known brand that offers a range of Windows workstations, including desktops and laptops, that are designed for professionals in fields such as engineering, architecture, and graphic design.

These are just a few examples of the leading Windows workstation manufacturers, and there are many other companies that also provide high-quality workstations for professionals.