In your Windows operating system, you may get many DLL files that are liable for the proper running of many applications installed in the Windows. Sometimes you will see that due to the accidental deletion or corruption of these DLL files, your computer becomes very unstable and you get many errors in it. Core.dll is missing error in Windows is also such types of errors that come to you due to the missing or corrupt Core.dll file. The error is very hazardous and dreadful that stops the computer working properly. So, it is very important to fix the problem with some manual or automatic methods. The issue can be automatically resolved with the help of the Advanced System Repair tool.