The first figure implies that devices drivers run in ring 1 and 2, that is not the case. The x86 architecture defines four rings. Windows uses ring 0 for kernel mode and ring 3 for user mode. The reason Windows uses only two levels is that some architectures, such as ARM and MIPS/Alpha, implemented only two privilege levels. Settling on the lowest minimum bar allowed for a more efficient and portable architecture, especially as the other x86 ring levels do not provide the same guarantees as the ring 0/ring 3 divide.
Source : “Windows Internals Part 1”