The best answer I saw:

bluetooth connection is incredibly unreliable/intermittent when in Windows (I run Windows 7 64-bit and Boot Camp 4.0, and got both devices connected without any trouble via Bluetooth). https://discussions.apple.com/thread/4079148

• Operating System: Microsoft Windows 7 (64-bit) I need bluetooth drivers for win 7 64 bit. Nothing supplied by Broadcom allows me to pair speakers with the notebook, and the option 'allow a device to connect' is greyed out.
• Realtek RTL8723BE and RTL8188EE 802.11b/g/n Wireless LAN Drivers Realtek RTL8000 Series Wireless LAN Driver Windows 10 (64-bit), Windows 8.1, Windows 7 (32-bit and 64-bit), and POSReady.

Manually identify your Intel® Wireless Adapter and driver version number. Which file to choose? If you have Windows 7 32-bit: BT21.40.532Win7.exe; If you have Windows 7 64-bit: BT21.40.564Win7.exe; How to install. Download the file to a folder on your PC. Uninstall current version of Intel Wireless Bluetooth.

The setting can be found under: Control Panel> Device Manager > Network Adapters > Broadcom 802.11n Network Adapter - right click and choose 'Properties' Under 'Advanced' tab, highlight the setting named 'Bluetooth Collaboration', then change it to Enable. Then click OK.

Aug 9, 2012 8:36 AM

Purpose

Intel® Wireless Bluetooth® is recommended for end users, including home users and business customers with Bluetooth® technology.

Intel Wireless Bluetooth Package version 21.40.5

• Programs and Features version = 20.90.6
• Device Manager version= 20.90.6.4

Note: When you update the software package, it might not update the wireless adapter driver if it includes the same driver as the previous release.

Not sure what to download?

Confirm that you have Windows 7* operating system before installing. Check if your operating system is 32-bit or 64-bit.

Bluetooth A2dp Driver For Windows 7 64 Bit Free

Ensure that your wireless adapter is supported by this download. List of supported wireless adapters available below.

To determine which wireless adapter is installed in your computer system:

• Manually identifyyour Intel® Wireless Adapter and driver version number.

Which file to choose?

• If you have Windows 7 32-bit: BT_21.40.5_32_Win7.exe
• If you have Windows 7 64-bit: BT_21.40.5_64_Win7.exe

How to install

1. Download the file to a folder on your PC.
2. Uninstall current version of Intel Wireless Bluetooth.
3. Double-click the file to launch installation.

Realtek Audio Driver For Windows 7

Note: You may need to take additional steps if you have specific Microsoft Windows* updates installed and are upgrading the Intel Wireless Bluetooth Software from previous versions. Visit Troubleshoot Issue with Intel® Bluetooth and Microsoft Windows 7* Updates for details.

Bluetooth A2dp Driver For Windows 7 64 Bit Download

See the release notes for installation instructions, supported hardware, what is new, bug fixes, and known issues.

About Intel® software and drivers

The driver or software for your Intel® component might have been changed or replaced by the computer manufacturer. We recommend you work with your computer manufacturer before installing our driver so you don’t lose features or customizations.

See list of computer manufacturer support websites.