Hi,
First, I would like to point you to the creation of new Views. It is very useful feature since not all the data that is collected displayed by default. You can use views to customize information you want to be displayed. Please refer to "Creating Views" in Chapter 9 of Implementation guide for more details, if will guide you trough the creation process.
I also would like to ask you to run third party tool i.e. wbem to check the instances of the Install Product class. If some or all of the instances are not present it might point to the problem in dlls that were installed, therefore you might need to unregistered and register dll that you have problem with e.g. Install Product.
Please check that you have 3 dlls on your client machine: WmiInstalleProduct, WmiMachineInformation, WmiSymantecGhostEnterprise.
Hope this will help.
Orah