You may manually remove this agent by doing the following:
1- Run Command Prompt as administrator.
2- Type
SC DELETE FRRstSvc and hit enter.
3- Delete the following directories:
C:\Program Files\Quest\Recovery Manager for Active Directory Forest Edition, and
C:\Program Files\Common Files\Quest Shared\Recovery Manager for Active Directory4- Reboot DC to complete removal process.
Or, instead of doing the above, you may simply download a tool from Microsoft called
"Troubleshooter" which works for removing or uninstalling programs that fail when you try it from control panel. You may download troubleshooter from the following link:
https://support.microsoft.com/en-us/topic/fix-problems-that-block-programs-from-being-installed-or-removed-cca7d1b6-65a9-3d98-426b-e9f927e1eb4d