When you install Windows 2000 through MS-DOS or Windows 3.x, you need to start Winnt.exe. When you install Windows 2000 over a network, you can insert the CD-ROM containing the installer on the network server and share the CD drive, or you can copy the files from the I386 directory of the CD-ROM to the shared folder, and then when you are ready to install Windows 2000, run the CD-ROM i386 directory or the installation files for the shared folder on the computer.
If Windows 95, Windows 98, Windows NT 3.51, and Windows NT 4.0 are already installed on your computer, you can plug it directly into the optical drive after you start the operating system
In the CD containing Windows 2000 installer, open one of the Microsoft Windows CD dialog boxes, as shown in Figure 1-6.
After you choose Install Windows 2000, Setup detects the operating system that your computer uses, and gives the prompt, as shown in Figure 1-7, to ask users if they want to upgrade the current operating system. When you need to browse the Setup disk, click "Browse to this C D". If you have installed Windows 2000, install additional components is in an optional state, which allows you to add some optional additional components to the Windows 2000 operating system.
When you click the Yes button, open the Windows 2000 Installer dialog box, as shown in Figure 1-8. When the upgrade to Windows 2000 radio button is selected, the current operating system is upgraded, but the existing settings and installed programs are not changed, as recommended by the Installation Wizard. After you select the Install new Windows 2000 (new Installation) radio button, users need to specify new installation settings and reinstall existing software, and multiple operating systems can be present on the computer.