KB 942567 - Windows Vista Feature Pack for Wireless

This software update includes the following components or features that improve wireless support in Windows Vista: Bluetooth version 2.1 support, Unified Pairing user interface, and Windows Connect Now updates.

Some of these features may work with existing hardware. However, you must have new hardware to take advantage of the new functionality.

This update is compatible with all versions of Windows Vista and can be installed only on a computer that is running Windows Vista Service Pack 1 (SP1).

Read more about it here.