A. This is usually caused by the Resource Kit being installed in a long file name directory, e.g. d:\program files\reskit. To get rid of this problem install the resource kit in a short name directory (8 characters or less).
If you go to a command prompt and type WINAT, it will actually start OK even if it's on a long file/path name. If you do it from your Start menu or Start Run, it will fail.