I have just updated to ZCM 10.2.2, and read the following in the release notes
5.2.3 Asset Inventory

Code:
This section contains information about issues that might occur with Asset Inventory.
5.2.3.1 Unable to inventory the BIOS details for Windows 7 64-bit devices that have SMBIOS 2.0 or earlier installed

Workaround: None.

If you want to inventory the BIOS details for Windows* 7 64-bit devices, you must have SMBIOS 2.1 or later installed on these devices.
Our 64 bit Windows 7 machines, registered with ZCM do not show any info from the BIOS, so I am assuming this is the problem.

If that is the case, how do you install SMBIOS? Where do you download it?