This post is as much for my own sanity as the community at large. Having taken the step back to Windows from my Mint desktop on my Dell, the Bluetooth driver from Dell failed badly and Windows 8,1 Pro flatly refused to detect my Dell 370 Wireless card.
Then I found: http://www.thaivisa.com/forum/topic/720042-broadcom-bluetooth-370-minicard-in-windows-81/
Which led me to: http://support.lenovo.com/us/en/downloads/ds034872
Downloaded and installed the Lenovo Driver and all working just great - Bluetooth Mouse and Keyboard connected and writing this article with them!!!
Come on Dell!!! Easy fix if Lenovo could do it!