Hi,
Here some Introduction about the Windows 7 AppLocker

Windows 7 addresses the growing desire for application control solutions in the enterprise with the introduction of AppLocker: a simple and flexible mechanism that allows administrators to specify exactly what is allowed to run in their desktop environment. As a result, AppLocker provides not only security protections, but also operational and compliance benefits by:

* Keeping unlicensed software from running in your desktop environment

* Preventing vulnerable, unauthorized applications from running in your desktop environment, including malware

* Stopping users from running applications that needlessly consume network bandwidth or otherwise impact the enterprise computing environment

* Preventing users from running applications that destabilize their desktop environment and increase helpdesk support costs

* Easing enterprise software deployments and maintenance through effective desktop configuration management

* Allow users to install and run approved applications and software updates based upon their business needs

* Helping ensure your desktop environment is in compliance with corporate policies and industry regulations such as PCI DSS, Sarbanes-Oxley, HIPAA, Basel II, and others