Cannot Install Windows 2000

We recently bought a a dozen computers, and have had NT4.0 installed on it. We were migrating to Windows 2000 and cannot install it on these machines. They will Take all other Window’s operating systems including XP but not Windows 2000. The Compters have an ASUS cuv4xe motherboard with VIA chipset. Pentium 4 processor running at 667mhz. Memory is 128mb (Kingston) with a Western Digital WD200 Harddrive Rage 128 Video Card, and a 3com pci nic. All 12 computers will not take the Windows 2000, and Windows 2000 server Operating system. However they will Take All other Windows operating systems.