If you’ve lost your installation CD and are in need of re-installing, you have probably found that it is hard to find software to download. It seems as though Motorola no longer wants to acknowledge the existence of any software for these adapters. Motorola has changed up their site a bunch. The only way that I found a link to the drivers is by visiting a Google cache of the webpage that describes the download.
Here is Google’s cached version of the page that links to the driver download: http://webcache.googleusercontent.com/search?q=cache:9etLm2zY6g0J:direct.motorola.com/hellomoto/nss/pc850btsw/