MSDOS =/= FreeDOS.
FreeDOS | The FreeDOS Project
It's basically saying 'here's the hardware, and we'll provide a basic OS." - Similar to if they were to preinstall Linux on it for you instead of Windows.
I think I remember HP doing this with some laptops; I know Dell did it with some systems as well.
Anyway, as long as it's a fairly recent laptop, it shouldn't have any issues with drivers for a full Windows install. Just keep in mind, you'll have to purchase your Windows license separately.