jvhooijdonk - Changing the WinDir to SystemRoot just changes the error in the InjectScriptHandler log to 'cannot find variable SystermRoot' instead.
Kenyon - Is there not a way for me to specify that the OS should be filling that variable with a windows environmental variable? I'm not sure what's going on behind the scenes, is the provisioning script going through and replacing the variables in the unattend file and then injecting it for the OS to process once it boots? If that's the case, isn't there a way to tell the provisioning engine to ignore that variable and let the OS handle it?