Installing this driver worked for me on my Dell Studio XPS M1640 with 370 card:

support.lenovo.com/.../ds031999

This Lenovo driver worked for me. Windows 10, Dell E6400 Notebook, Dell 370 Wireless BT card.

support.lenovo.com/.../ds031759

This Lenovo driver worked for me. Windows 10, Dell E6400 Notebook, Dell 370 Wireless BT card. support.lenovo.com/.../ds031759

This worked well for me on my Dell XPS 1340

XPS 1645 370 BT Driver Win 10. > I had the same issue and what I found was that I needed to go into Add/Remove programs and Uninstall the Broadcom driver software from Windows 7. Once I did that I then used the Broadcom drivers for Windows 10 provided by Lenovo (which is the same as Broadcoms but the installer works). The Lenovo version of the Broadcom driver can be found at the link below.( if link gets broke just search for Lenovo Broadcom Bluetooth Windows 10).  Another issue that needs resolved is garbled audio via BT and that can be resolved by downloading Realtek's Windows 10 HD audio codec. I hope this information is helpful to anyone who has faced the same issue. I know personally I spent numerous hours with both Dell and Microsoft trying hopelessly to get this resolved. Thankfully I just gave in and plugged away at my own research and managed to get the issue resolved. It took me about 3 hours of research and only 5 minutes to actually get it going (including restart and device pairing). So glad I got this resolved... good luck.