To stop the SpywareTerminatorShield.exe process, the Real-Time Protection Shield, Scheduler and Automatic Updates needs to be turned off.
If you still want to remove SpywareTerminatorShield.exe from startup, follow these steps:
Open Spyware Terminator 2015.
Open the Spyware Terminator 2015 settings by clicking the advanced menu tab at the top right corner of the Spyware Terminator 2015 window and select "Settings". Uncheck the "Show Spyware Terminator 2015 icon in System Tray" checkbox.
Click on "Real-Time Protection" on the left panel and uncheck the "Use Real-Time Protection" checkbox.
Click on "Scan" on the left panel and uncheck the "Use automatic scan" checkbox.
Click on "Update" on the left panel and uncheck the "Use automatic update" checkbox.
Click the "OK" button to confirm changes.