I too have the same problems with my new BB Bold 9000.
As to the first driver problem, If you check the available services for the BB in bluetooth/device properties it shows 3 services. I have disabled the 2 blackberry ones and left the modem ticked, this stops the "bluetooth peripheral" driver prompts. It looks like there are no drivers for these blackberry services available for Vista.
As to the second problem I have this on both my Vista desktop and my XP pro (SP2) laptop. Before upgrading I had an 8100 pearl and this worked fine (it can't be my bluetooth adaptor/drivers). The only difference was the Pearl was on an earlier version of device software. I wonder if this problem is linked to 4.6?