How to Fix Iertutil.dll

1. Click the 'Start' button in Windows, then expand the 'All Programs' folder, then the 'Accessories' folder and finally the 'System Tools' folder. Click the 'System Restore' icon.
2. Click 'Restore my computer to an earlier time' and click the 'Next' button.
3. Select a restore point from the calendar by clicking a bold date. If your problems with iertutil.dll are new, select a restore point from just before the problems started. If you aren't sure when the problems started, scroll back through the months on the calendar by clicking the 'Back' button on the left side of it and click the earliest bold date that appears. Once you select a restore point, click the 'Next' button.
4. Review your selected restore point on the confirmation screen, then click the 'Next' button. In Windows Vista, this is a 'Finish' button instead.
5. Wait as your computer restores and reboots, which will take several minutes. When the computer boots back up, the .dll file will be restored and IE7 should work properly. To make sure you have the latest version of this file, however, and to make sure your restored copy of IE7 is up to date, proceed to the next step to reinstall it.
6. Open your Web browser and navigate to the download location for the IE7 installation file. You can find a link to this page in Resources. When the page loads, click the 'Download' button and save the file to your hard drive.
7. Double-click the downloaded file to launch the Installation Wizard. Follow the on-screen prompts to re-install IE7, which will update iertutil.dll. At the end of the installation process, you will be prompted to reboot your computer. Select 'Restart Now' and wait for your computer to reboot. When it boots up again, IE7 should be fully updated, iertutil.dll should be fully restored and all related errors should stop.