Iesetup.dll error messages might appear when users are going to run an application or click a link. It is a legitimate component of Windows Vista.

Common Iesetup.dll error messages:
- "Windows could not start because the following file is missing or corrupt: Windows root\system32\Iesetup.dll."
- "Winnt_root>\System32\Iesetup.dll missing or corrupt: Please re-install a copy of the above file."
- "Cannot find \Windows\System32\Iesetup.dll."
- "Cannot find Iesetup.dll."
- "A required .DLL file, Iesetup.dll was not found."
- "Program requires the file 'Iesetup.dll' to run. Run Setup again to assure proper installation."

How to install iesetup.dll file?

1. Press Start and select Run
2. Type CMD and press Enter (or if you use Windows ME, type COMMAND)
3. Type regsvr32 iesetup.dll and press Enter
4. In the end, you should receive a message saying that your file was successfully installed or uninstalled.