Well I bought a Bluetooth dongle from Halfords(!--in amongst the car parts) and it had the Bluesoleil software. I simply didn't put the Bluesoleil CD in the drive and Windows discovered it. I did the same with Belkin and TDK dongles. (Un-)fortunately I've never been in the situation where another protocol stack and driver was present first so can't give good advice. I think the normal recommended process is to go to device manager select the dongle, click update driver and choose the microsoft driver from the list...
Alan J. McFarlane
http://www.alanjmcf.me.uk/
Please follow-up in the newsgroup for the benefit of all.
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