First, in order to to fix the issue, go to Start, type cmd and open the application using Administrator rights. Type sfc /scannow and press the Enter key. After that, run a virus scan of your entire system using your security program or one from Software Informer database. If the problem persists and you're using Windows XP or below, update Windows Installer using the package provided by Microsoft. If you're using Windows Vista or above, update it through Windows Update. As an alternative, you can try to run Dll-Files Fixer which is developed to solve all major .dll related problems. If you still have issues, I suggest you get in touch with Microsoft Support Team.