On an inventory policy or task page, at Advanced Options > Data Classes, you can select the types of inventory data that you want to gather. You can select a whole category or expand it and select a more detailed set of data.
Data classes of a predefined policy are pre-selected based on the policy.
When you select or unselect a data class, you may get the error message Data could not be loaded or Permission denied, if you use the name of the computer instead of localhost to access the Symantec Management Console, for example http://SouthernWingNS/Altiris/Console/.
To eliminate the errors, you need to add the link to the Symantec Management Console at Internet Explorer > Tools > Internet Options > Security > Trusted sites > Sites. Then you should close all the instances of Internet Explorer and reopen the Symantec Management Console.