When installing RoboPDF an error is generated:
"Enum Monitors Failed"
And installation fails to complete.
There is a conflict between Adobe Distiller printer drivers and RoboPDF. During the installation process if Adobe Distiller is installed, this error may occur.
Uninstall RoboPDF with the following utility, then uninstall Adobe Acrobat.
Re-install your RoboPDF, once finished, Reinstall your Adobe Acrobat (distiller).