I was working this weekend trying to configure my mobile device to work with Exchange and needed to transfer a certificate for RPC/HTTPS to work. 

I remembered that I can access my phone from my PC either by tethering it with the USB cable or by using Bluetooth.  Then I realized that for some reason I could not enable the Bluetooth adapter on my laptop.

I researched the issue online via Live search and this issue has plagued several as indicated in the public forums.

I tried downloading the Vista 64-bit driver for my Dell Latitude E6500 shown here:

To complete the install, this required a reboot.  Once the system restarted, I noticed the panel light was lit above the keyboard which is a good sign.  Upon inspection of the device manager, this is what I saw:

So the Vista driver worked great!

I have been having similar issues in server 2008 with my onboard NIC and wireless cards so I'll be installing the Vista 64-bit drivers to see if those get resolved.

Read the complete post at http://owsug.ca/blogs/brad/archive/2009/02/22/Bluetooth-radio-not-working-after-Windows-7-upgrade-_2D00_-Solved-with-Vista-64_2D00_bit-Drivers.aspx