IOException: No more files while searching for installation files

[gewe]

I have installed nLite 1.4.5 on a Windows XP Pro SP2 (dutch) workstation. I start nLite, select Dutch language, and browse to the directory where I copied the Windows XP Pro SP2 (dutch) installation CD. I then get the following error:

See the end of this message for details on invoking 
just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************
System.IO.IOException: Er zijn geen bestanden meer.

   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
   at System.IO.Directory.InternalGetFileDirectoryNames(String path, String userPathOriginal, String searchPattern, Boolean includeFiles, Boolean includeDirs, SearchOption searchOption)
   at System.IO.Directory.GetFiles(String path, String searchPattern, SearchOption searchOption)
   at .	.()
   at .	.WndProc(Message& )
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

I then have two options: Continue and Quit. Quit does what it is should: quit nLite. Continue does nothing except change the mousepointer into an hourglass.

What is wrong here?