It is a commercial keystroke logger.
It also reports the process that keystrokes are being typed into and can be run in a silent mode.
Navigate to the key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
then delete the value: "SAGENTSERVICE"="%ProgramFiles%\TinyStone\Tiny Spy Agent\Sagent.exe -start"
Also, delete the key: HKEY_LOCAL_MACHINE\SOFTWARE\TinyStone\Tiny Spy Agent