A lot of people appear to be unaware of the fact that you do NOT need the 4, 5 or 6 setup disks in order to install Windows 2000 and XP. A common Win98 boot disk such as the Boot Disk Essentials diskette link below can be used to install these OS's. Here's how to do it:
Start the computer with your chosen boot disk.
Change to the cdrom drive.
Go into the \i386 directory on the cdrom.
Run WINNT.EXE to begin the install process.