Installing Visual Studio.Net prevents install of .NET Server Admin

Since I installed the following:

Visual Studio.Net
Visual Studio Tools for the Microsoft Office
Office 2003
SQL Server 2000

I cannot install Windows .NET Server Administration Tools Pack on my PC. The
error displays "This can only be installed on Windows XP Professional. Pleas
e
obtain the proper OS and service pack before running the wizard."

I already have Windows XP Professional SP2.

Jack@aros.net