WiX checking for .NET Framework 4

I am trying to implement a check to see if the .NET framework is installed when running the installer. I added the following: ``` <Wix xmlns="http://schemas.microsoft.com/wix/2006/wi" xmlns:netfx="http://schemas.microsoft.com/wix/NetFxExtension"> <PropertyRef Id="NETFRAMEWORK40FULL"/> <Condition Message="This application requires .NET Framework 4.0. Please install the .NET Framework then run this installer again. Contact support at support@Swiftposter.com if you have further issues."> <![CDATA[Installed OR NETFRAMEWORK40FUL]]> </Condition> ``` However, It always seems to result in false because it keeps stopping me even thou I have the full .NET framework installed (not just the client). What does this happen?