Finally I found a couple of drivers for Windows 7 64-bit on my Lenovo X1 Carbon that worked with my Bose Quietcomfort 35...
For a couple of days I've had major problems with uninstalling the old Intel Bluetooth drivers and installing the new ones. I believe what worked for me was downloading CCleaner (as some other forum suggests) and Disable the Bluetooth startup/autostart. Then thru CCleaner I managed to remove the bluetooth drivers.
CCleaner doesnt seem to be a virus (for those of you who wonder... I did!). I have a corporate computer with Symantec Endpoint protection and it installs without any virus notification.
I was surprised when I found these drivers (that doesnt show up for me when I search with the Intel(R) Driver Update Utility tool). Try it out on your own risk of course...