Before we go any further, we would like to inform you that Intel does support integrations which is when you change the original adapter that came installed in your computer when you bought it for a different one. Please take a look at the information on this link for further further information on this matter: Intel® Wi-Fi Products — Regulatory Information Regarding Hardware Installation or Upgrade
On our best effort to help you with this issue, make sure all Bluetooth* files from the previous adapter has been clean uninstalled as it may be causing the conflict and consequently showing the error message. Do it from device manager to the point that Windows* will no longer show any file and then try to install the Bluetooth* drivers again. We also highly recommend that you contact your computer manufacturer and check with them whether they have any drivers for this adapter. It also my be that your system is not compatible with this adapter.
Some other users found a workaround that resolved their Bluetooth issue. Please take a look at this link: Intel Centrino 6235 Bluetooth not detected by windows 7
*The answer found there is not official from Intel and may not work for you so please be cautious. Also important to understand that Intel is not responsible for any possible damage that such workaround may cause to the adapter.