The supported dual-boot configurations are:

Personal Operating System Professional Operating System Professional Operating System
Windows Millennium Edition (Me) and Windows 2000 or Windows NT 4.0
Windows 98 Second Edition and Windows 2000 or Windows NT 4.0
Windows 98 and Windows 2000 or Windows NT 4.0
Windows 95 OEM Versions and Windows 2000 or Windows NT 4.0
Windows 95 and Windows 2000 or Windows NT 4.0
Microsoft does NOT support dual-booting between multiple personal operating systems.

Microsoft does NOT support triple-booting Windows NT, Windows 2000, and a personal operating system.

Multiple operating systems on the same partition are NOT supported.

Microsoft recommends that you install the personal operating system first.

The C: partition must use a file system that each operating system can boot from.