By default, the 'Install Experiment' LabAuthor Utility installs the Experiments in the following location:
In Windows 7 / 8:
Start | Computer | C:/ | Users | Public | Public Documents | ADInstruments | LabTutor | Experiment Files
In Windows XP / Vista:
Start | My Computer | C:/ | Users | Public | Public Documents | ADInstruments | LabTutor | Experiment Files
This can be configured prior to Installing by clicking the 'Browse' button at the top-right of the main page of the 'Install Experiments' Utility: