Install/uninstall NT service (may have to run these batch files via Run As Administrator):

%SONARQUBE_HOME%/bin/windows-x86-32/InstallNTService.bat
%SONARQUBE_HOME%/bin/windows-x86-32/UninstallNTService.bat

Start/stop the service:

%SONARQUBE_HOME%/bin/windows-x86-32/StartNTService.bat
%SONARQUBE_HOME%/bin/windows-x86-32/StopNTService.bat