First try using the Microsoft Uninstall Utility which can help resolve the following issues:
- Corrupted registry keys on 64-bit operating systems
- Corrupted registry keys that control the update data
- Problems that prevent new programs from being installed
- Problems that prevent existing programs from being completely uninstalled or updated
- Problems that block you from uninstalling a program through Programs and Features in Control Panel
- Download the Utility from here: https://support.microsoft.com/en-sg/help/17588/fix-problems-that-block-programs-from-being-installed-or-removed
- Run the file MicrosoftProgram_Install_and_Uninstall.meta.diagcab
- Select Uninstalling
- Select the program to uninstall, for example Backup Agent
- Click Next
- Click Yes
- Try uninstalling again using Programs and Features
- If the uninstall is successful, manually remove the installation directory
If you are still not able to uninstall, please try the following:
To find the registry key required to uninstall the program, follow the instructions below:
- Open Registry editor.
- Browse to HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Uninstall.
- Find the entries that mention 'Quest Backup Agent'.
- Find the 'UninstallString' key, double click it and copy the value. The value contains the full command needed to uninstall the product.
Please note: If you have an Recovery Manager for AD version prior to 9.0, any folder/registry paths referenced may contain the non-Quest branded path instead of ‘Quest’