Greetings --
Because, by trying to start the Win2K installation from within
WinXP, the OS naturally presumes that you're trying to "downgrade."
It has no way of knowing that you want a dual-boot configuration. No
OS that I've ever heard of has the built-in ability to replace itself
with an older version.
The Win2K installation must be started from outside of WinXP -
normally by booting from the Win2K installation CD. Also, in general,
when configuring a multi-boot system, the older operating system(s)
should be installed first.
Description of Supported Dual-Boot Configurations Between Windows
http://support.microsoft.com/support/kb/articles/Q289/2/83.ASP
How to Multiple Boot WinXP, Win2K, WinNT, Win95, Win98, WinMe, and
MSDOS
http://support.microsoft.com/support/kb/articles/Q217/2/10.ASP
Multibooting with Windows 2000 and Windows XP
http://www.microsoft.com/windows2000/techinfo/administration/management/mltiboot.asp
Multibooting with Windows XP
http://www.microsoft.com/windowsxp/pro/using/howto/gettingstarted/multiboot.asp
There is one method that may work for you, assuming you already
have the empty partition onto which to install Win2K:
MS-MVP Doug Knox's Install Win2K after WinXP is already installed
http://www.dougknox.com/xp/tips/xp_repair_2k.htm
Bruce Chambers
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