I have exactly the same problem and have tried all the solutions listed here to no avail. It just cannot seem to detect my new bluetooth speaker. Also it immediately connected to the bluetooth on my phone no problem. Troubleshooter also said exactly the same thing. Looks like there is a bluetooth issue with windows 8.1. I am going to a computer club next week to see what they say about it. I am at the limit of my expertise. I am having a massive bbq soon and need the speaker to be operational. It's very frustrating.
If they do manage to solve it, which i highly doubt, do lemme know. Unless of course, its a system wipe. Kinda like burning down the house to kill a spider.