You can use http://msdn.microsoft.com/en-us/library/aa370556(VS.85).aspx to 
determine if you have Windows 2000 installed and 
http://msdn.microsoft.com/en-us/library/aa370329(VS.85).aspx to determine what 
flavor of it is installed.
If you are using WiX V3, examine 
http://msdn.microsoft.com/en-us/library/ms724833.aspx and search for "OSInfo 
custom actions" topic in WiX help.
Sorry, I did not get what you are asking in your second question.

Alex



-----Original Message-----
From: Sean Farrow [mailto:[EMAIL PROTECTED]
Sent: Monday, September 29, 2008 2:35 PM
To: wix-users@lists.sourceforge.net
Subject: [WiX-users] launch condition query

Hi:
I am constructing a launch condition to require windows 2000 server
professional or later. I currently have the following:
  <Condition Message="[ProductName] requires Windows 2000 or
later."><![CDATA[VersionNT >= 500]]></Condition>
What do I need to add to require the professional version of windows
2000?
aditionally, I am checking for an installation written with a different
tool, I wish to run the uninstaller at launch if this exists. Wha is the
best way of achieving this with a launch condition?
Cheers
Sean.
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