Why is there two different ways to install XP Pro?

It appears that there are two completely separate ways to install Windows XP Pro

On our one computer WinXP starts out with a modern install screen similar to Win ME, but then after it reboots it reverts back to the old Windows 2000 style of installation.

One our other computer WinXP installs COMPLETELY in the new style install screen.

Both computers are new.

Why do they do this, and how can we force winXP to always use the newer style of installation?

 

Could it be motherboard variations?? Or are they the same?

 

The computers are both pretty similar. We cannot install XP on one. The other one used the newer style screen and it installed without a hitch.

It seems to change "styles" right after the first reboot.