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I have an Acer laptop with Windows 7.I've recently purchased a USB stick for bluetooth connection -- http://www.agknordic.com/new/index.php?side_id=366 It works fine with my friends phones,laptops etc. However this is my case. As soon as the driver of the stick attempts to connect the phone Windows Explorer crashes and restarts itself. It's written that the stick supports A2DP Bluetooth technology. Is this Sony Ericsson supporting the same?
You can try deleting all other bluetooth connections to your laptop and refresh the list with only your phone visible.I had a similar problem with my phone to PC bluetooth connection and this was the only way I found to establish a connection.