My OS was XP SP2, I just upgraded from the leaked SP3 RTM installer, not a slipstream SP3 install. Next/back is fine. The problem seems to be (from my amateur programming POV) that any time I trigger an OnClick() in a child window (like the file select browser dialog for finding a windows install directory to work from: I can open the dialog, and browse directories, but clicking Open or Cancel will cause the dialog to close, then nlite will die a few seconds later, if I choose a directory that doesn't have an i386 subdirectory, it will pop up a notice window telling me to try again, when I try to dismiss that, nlite freezes, same with the "that's a WORM media, you'll have to choose a working directory on your harddrive to proceed" notification window) My .NET version was 2.0, btw, I tried installing the SP1 release for .NET 2.0, but that didn't help (although the .NET update said it installed properly).