I would like to perform a conditional check to see if WinXP SP2 is installed *before* the prerequisites are installed.
I have added the condition to the Product Properties but it executes too late. It only checks the condition after the prerequisites have been installed.
I need to tell the user that he can only install if he has XP SP2 installed and then the install must exit before installing any prerequisites and the application.
The problem is that I need to install on other target platforms as well, not just XP and there doesn't seem to be a way to say IF we are running on XP, then check if we have SP2 installed. ELSE continue to install the prerequisite.
OS Conditions are evaluated such that only one has to pass, but I forget if, say, XP SP1 will satisfy a check for Windows 2000 SP4. If that doesn't work, the two possibilities I see are creating multiple copies of your prerequisites (if they're downloads or you have plenty of free space on your media), or creating a helper exe which checks for this and skips the install. The problem with the latter is that you'd have to ignore real failures, or this will cause one to be detected.
I guess one other alternative would be to use feature prerequisites, at least if the prerequisites in question do not include windows installer or the .NET framework.
