Reinstall Iertutil.dll

1. Go to a free DLL download website (see Resources) and click "Download iertutil.dll."
2. Click "Save" in the confirmation pop-up, navigate to the location on your hard drive where you want to save the file and click "Save" to begin the download.
3. Right-click the saved file and select "Copy." Go to the "Start" menu, click "Computer" or "My Computer," double-click the "C:" drive, double-click the "Windows" folder and then the "System32" folder. Right-click anywhere in a blank space and select "Paste."
4. Go to the "Start" menu, type "run" in the "Start Search" box and hit "Enter." (Windows XP users: Go to the "Start" menu and click "Run.") Type the following command in the search field and hit "Enter" to register the DLL:Regsvr32 "C:\Windows\System32\example.dll"Click "Yes" in the pop-up to confirm the registration.
5. Restart your computer.