Office XP Setup thinks Win2000 is WinNT4 sp5

[T Walters]

I cannot run Office XP setup anylonger.

It immediately reports an error message, saying that
Windows NT4 SP6A or higher is required.

This system has Windows 2000 Pro SP4 (same thing with SP3).
with IE5.5sp2.

Here is a copy of the setup log file:
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Launch Setup
10/23/2003 1:34:26 PM
/AUTORUN
Detected Windows Info:
PlatformId = 2
MajorVersion = 4
MinorVersion = 0
Setup path: D:\setup.exe
Recognized command line switch: /AUTORUN

Searching for .INI file: setup.INI
D:\FILES\SETUP\setup.INI
Settings file located: D:\FILES\SETUP\setup.INI
GetTempPath returned: E:\TEMP\

NT Version 4 detected
NT Service Pack 0x500 detected. (Minimum 0x600 required)
Microsoft Office XP Professional cannot be installed on
this computer.

This product requires Microsoft Windows NT 4.0 Service
Pack 6a or later. Please download the service pack from
www.microsoft.com prior to installing.


***** Setup exits
10/23/2003 1:34:35 PM
(return = -201)