Ntdll.dll is a dll file that holds Windows NT functions, a portion of the Windows operating system core. Your computer may show a black screen with error and will not boot up at all if the ndtll.dll is corrupted or missing, due to hard drive errors, software errors, virus attacks or any such bad happening. The operating system will not be able to start with an invalid ndtll.dll file because the ndtll.dll file is a critical component for the overall functionality of the operating system.

Please note that downloading the ndtll.dll file from somewhere on the web and attempting to copy the file in your system will not solve the problems, it is just time wasted because the ndtll.dll comes in a large number of different versions so it will not work. To solve ndtll.dll errors you will have to reinstall your Windows OS from the original Windows install CD. You may want to use the automatic repair option provided by the Windows operating system instalation process.

You should try to find out what caused your ndtll.dll file to get corrupted or missing. This file cannot be deleted accidentally because the operating system prevents the users and programs from deleting or altering the ndtll.dll file. Chances are there was a virus in your computer , or you are having some sort of hardware problem, in most cases should be someting wrong with your hard drive (either a hardware error or a filesystem error). A system checkup done by a computer tech is highly recommended. You may also want to attempt checking your hard disk for errors and performing a surface error check. It is recommended that you do a full check of your computer in order to identify the way the dll file ndtll.dll has been corrupted so you can also prevent this problem from happening again.