Got the same device error messages in re my Intel bluetooth and Nvidia 960 card. These are both new within the month. Microsoft shouldn't be inviting people to 10 yet, if device checks reveal currently incompatible hardware. It will spook the civilians.
This thread is ancient, but I shall reply to the ether. Windows 8.1 is hopelessly broken and Mail is a particular disappointment. The best hardware on the planet can't offset the deficiencies in software.
Re: Windows Phone 9 features wishlist
The list is long but v. well thought through. If MS is going to contend with Android, they need to pay attention to your polite critique.
My experience has been that network clients appear and disappear with puzzling frequency. What's truly odd is that I can always access the clients by typing the I.P. address into File Explorer.