Hi Nizzyk99,
This error might occur if
1. The installation is being run from a Zipped file
2. The file Actares.dll is missing or corrupt
3. The installation is not able to write this file
Workaround:
1. Run the SEP installation (setup.exe) as administrator
2. Use “Custom” settings
3. Select only the “Core Files” for installation
4. Upon completion of installation, go to add or remove programs and add the required features.
Note: Replacing the Actares.dll from a working machine and then registering it , can also help in resolving the issue in case of a corrupt or missing Actares.dll.