There are so many components in the Windows computer that are very much responsible for the proper functioning of the computer and its applications. DLL files are also very important features. The DLL files are associated with various applications or programs installed in the system and these applications or programs run due to these files. But missing or corruption in these files may lead to severe error issues. Rpcrt4.dll is missing error in Windows is also that type of error that should be rectified very soon after the happening. Using some manual procedures may help you to fix this issue or you can also download Advanced System Repair tool to fix the issue automatically.