Uninstall Bluetooth Authentication Agent

You have uninstalled the Bluetooth Authentication Agent, but a Bluetooth-related entry still exists in the WinXP Registry, you get error message : “RUNDLL Error loading irprops.cpl” error when you start WinXP

To solve the problem, remove the Bluetooth Authentication Agent using the Add Or Remove Programs control panel. Sometimes when you remove Bluetooth, the Registry entries still attempt to control authentication between the device and your computer. To remove the Registry entry, click Start and Run, type regedit, and click OK

Look for the following Registry entry: HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\WINDOWS\CURRENTVERSION\Run. Right-click BluetoothAuthenticationAgent and click Delete. Close Registry Editor and restart your computer. Use the WinXP Registry program as a last resort to troubleshooting the most arcane error messages