You now understand that in order to repair an ntdll dll missing error the first matter
to be dealt with is to check the integrity of your registry system. 'non-related' registry keys often cause problems with your windows os and the best method to detect the unnecessary keys is to put one of these tools to work. Why not start now? simply download and install an error cleaner and experiment with a scan of your registry; with very little effort on your part, these errors will be out of your computer in no time. An important thing to understand is that your pc is just like anything else you need and value since it requires "tlc" from time to time to keep it operating at its optimal level. In all likelihood you learned some new information here; i hope that it has given you the resources to eliminate your computer of these inconvenient glitches.