Uninstalling SOI from a System and attempting to reinstall detects old database and SAMUser. A clean uninstall requires renaming the hidden folder \Program Files X(86)\Zero G Registry prior to reinstall.
Follow the following steps to avoid the error:
1) Uninstall SOI Manager
2) Rename the hidden folder \Program Files X(86)\Zero G Registry
3) Rename or delete old \CA\SOI folder (if exists)
4) Rename or delete "HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\CA\SAM" key
**Reboot if needed
5) Reinstall SOI Manager