Things You'll Need
Go to "Start > Control Panel > Add/Remove Programs."
Scroll down until you find the name of the Bluetooth device you want to update. Click on it and hit "Change/Remove Program" at the top of the screen. It will tell you the technical name of the product, which is "UGX."
Go to "Control Panel > System > System Properties > Device Manager."
Find the "UGX" on the list of devices and select "Update Device Driver."
Choose "Show all hardware available."
Select "Bluetooth > Bluetooth Adapter." It will automatically install the latest drivers.
Restart your PC and try to use the Bluetooth device again.
Tips & Warnings
If you are installing Windows XP SP2, the software will not override the existing Bluetooth software, so you may want to change the stack.