Hi everybody,

I have a laptop and windows 8 pro(x.64).

The Bluetooth key in " change pc settings==> wireless was grey out. So I can't use its Bluetooth. please help me.

Download and install the latest Chipset and Bluetooth driver,WIFI driver   from the manufacturers website.

See also:

http://windows.microsoft.com/en-US/windows-8/why-isnt-windows-finding-device

all of hardware drivers and windows 7 x.64 are updated. 

Why have you tried drivers of Windows 7 instead of Windows 8? Have you tried uninstalling and reinstallin

excuse me, its windows 8 is updated.

Hi mahdy-fr,

Did the Bluetooth work before ?Have you tried to reinstall the Bluetooth driver to have a check ?

We may need to download the driver from the manufacturer to have a check .

Best regards

hi 

yes, it worked before. now other devices can discover it, but they can't send files to it.

Hi mahdy,

"now other devices can discover it, but they can't send files to it."

So the issue has changed and the present issue is that the files sended from the phone can not be received by the machine ?Have you got any error messages ? Will the phone receieve the files from the phone ?Have you tried to send other types files to have a check (Some fromats may not be supported by bluetooth )?

Here is a similar symptom for reference :

Can't send files using bluetooth from Phone to Windows 8.1 PC
http://windowsphone.stackexchange.com/questions/5807/cant-send-files-using-bluetooth-from-phone-to-windows-8-1-pc

NOTE: This response contains a reference to a third party World Wide Web site. Microsoft is providing this information as a convenience to you. Microsoft does not control these sites and has not tested any software or information found on these sites.

Best regards

By laptop can discover other device and vice versa, but can't send and receive any files.

Hi,

Bluetooth key in " change pc settings==> wireless was grey out

Have you checked the Bluetooth Devices settings under control panel\Hardware and Sound or check the bluetooth settings by using the Bluetooth icon in the right bottom system tray.

The following link can be helpful (please ignore the fixit, but pay attention to the troubleshooting steps)

http://windows.microsoft.com/en-hk/windows-vista/troubleshoot-problems-with-bluetooth-enabled-devices 

now other devices can discover it, but they can't send files to it

And if all other devices have issues communicating with the specific bluetooth, then it will not be a Windows 8.1 system issue.