BlueAuditor - description from Softdepia.com:
Bluetooth Drivers and Installation Process
BlueAuditor only works with the Windows provided Bluetooth drivers. If you have purchased a new USB Bluetooth adapter then you should install it by simply plugging it in. Windows XP Service Pack 2 should automatically detect the adapter and install the appropriate drivers without you needing to install any software from a CDROM. Bluetooth Adapter
You will need a Bluetooth adapter which is supported by the Windows XP built-in Bluetooth drivers.
BlueAuditor - description from developer:
BlueAuditor is a private area network auditor and easy-to-use program for detecting, scanning and monitoring mobile devices in a wireless network. It can discover and track any Bluetooth device within a distance between 1 and 100 meters and display key information about each device being detected as well as the services device provided. With the growing popularity of the Bluetooth technology, BlueAuditor will enable network administrators to effectively audit their wireless networks against security vulnerabilities associated with the use of Bluetooth devices. BlueAuditor enables the user to save information about detected Bluetooth devices in an .xml file and supports the most Microsoft drivers available on the market. All the mentioned features are provided with a user friendly graphical interface.
BlueAuditor is a "Free to try" program. You can download and try it for an evaluation period.