Windows operating system is the most user friendly operating system. You can download and install many applications in the Windows to perform various technical works. Sometimes you may loss some system files like Nssutil3.dll file. It is a very important file that is responsible for the working of many applications or other software. After the missing or corruption of this file you may get Nssutil3.dll is missing error in Windows. You will not be able to access many applications or programs due to this error issue. So, it is very important to fix the problem using some manual or automatic way of troubleshooting. The error may be fixed automatically with the help of Advanced System Repair tool in the system.