Senior Windows Admin Needed Urgently

I am seeking a highly experienced Windows Administrator to provide temporary assistance with a critical issue on a Windows VM (Windows NT 6.2) running SQL 2012. After restoring from a C drive backup, we encountered several errors that need immediate resolution.

Key Issues:
- SQL Services are not starting, with the error: "SQLServerAgent could not be started (reason: Failed to load any subsystems. Check errorlog for details)."
- Windows Installer errors, specifically: "Error 1719. The Windows Installer Service could not be accessed."
- TDSSNIClient initialization failed with error 0x5, status code 0x1, indicating an infrastructure error.

Immediate Attention Required:
- The primary focus is on resolving the Windows Installer errors, as previous attempts to re-register the service have been unsuccessful.

Ideal Skills and Experience:
- Extensive experience with Windows Server administration and troubleshooting.
- Proficiency in diagnosing and resolving SQL Server issues.
- Familiarity with Windows Installer service and related error resolution.
- Ability to quickly identify and fix infrastructure-related errors.

Your expertise will be crucial in restoring the functionality of our system. If you have the necessary skills and experience, please reach out to help us resolve these issues promptly.