You can use Directory Monitor for the surveillance of certain directories and it will notify you of file changes, deletions, modifications, and new files in real-time. You can optionally execute an application when a change occurs.

Features:

Monitor directories for file changes, modifications, deletions and new files in real-time.

Monitor local directories or network shares (including hidden shares).

Run as a Windows service.

Optionally execute an application when an event occurs.

Log the user on the network that made the changes.

Include/exclude filtering on files being monitored.

Quickly tell if a directory is available and being monitored.

Balloon notifications whenever an event is fired.

Auto updating, import/export and more.

Directory Monitor is also available in a portable version.

Limitations: Requires Microsoft .Net Framework 3.5+ installed.