For existing Windows NT servers or clients, upgrading to Windows 2000 Server or Advanced Server is by far the easiest path. Doing so allows you to preserve all of the settings and, when upgrading the PDC, it allows you to preserve the domain and all of its user accounts and resources. Performing a clean installation (covered extensively in Chapter 5) is also an option, but it is unnecessary unless you are running a server operating system other than Windows NT 3.51 or 4. (Servers running earlier versions of Windows NT are usually better off upgrading to 3.51 or 4 first and then upgrading to Windows 2000, rather than performing a clean install.)
Similarly, setting up a dual boot is not recommended unless you have some need to use the existing Windows NT server or client configuration part of the time. Dual booting between Windows NT 4 and Windows 2000 has a number of limitations; for more information, see "Dual Boot Considerations" in Chapter 5.
To upgrade to Windows 2000 Advanced Server with the Windows 2000 Advanced Server upgrade CD-ROM, you need to be running Windows NT 4 Enterprise Edition. If you have the full version of Windows 2000 Advanced Server, intended for new computers, you can upgrade from any of the following products:
After you've planned the domain upgrade and prepared the computer (as discussed earlier in this chapter), you're ready to begin the upgrade. If you're upgrading a PDC, synchronize with the domain's BDCs one last time before you start the upgrade.
Close all open programs and disable all virus protection programs, and then insert the Windows 2000 CD-ROM. The Microsoft Windows 2000 CD dialog box appears if you have CD-ROM AutoPlay (Auto Insert Notification) enabled. (If this is not enabled, open the i386 folder on the CD-ROM and double-click winnt32.exe.) The dialog box asks if you want to upgrade the version of Windows. Click Yes to start Setup, and then follow these steps to upgrade to Windows 2000: