i have Compaq cq40 presario & i cant find an unknown driver in my notebook.

Hi owace,

1)    What is the complete error message you receive?

Method 1: You may follow the steps mentioned in the link below

Troubleshoot problems with Bluetooth enabled devices

http://windows.microsoft.com/en-US/windows-vista/Troubleshoot-problems-with-Bluetooth-enabled-devices

Method 2: Run the fixit available in the article below and check if that makes any difference

The Bluetooth item in Control Panel on a Windows Vista SP2-based computer does not work as expected when you click the item

http://support.microsoft.com/kb/960531/en-us

Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:

How to back up and restore the registry in Windows
http://support.microsoft.com/kb/322756/

You may follow the steps mentioned in the link below to setup Bluetooth device

Set up a Bluetooth enabled device
http://windows.microsoft.com/en-US/windows-vista/Set-up-a-Bluetooth-enabled-device

You may follow the steps mentioned in the article below which addresses unknown device issue (Article applies to Windows XP holds good for Windows Vista)

How to troubleshoot unknown devices that are listed in Device Manager

http://support.microsoft.com/kb/314464

Thanks and Regards:

Ajay K

Microsoft Answers Support Engineer

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