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Any suggestions or opinions about this problem ?

Hi all, great forum, I hope to have clues or a solution for my problem. Here it is... I'm working for a company that sells a lot of Bluetooth GPS devices each day. We need often to perform firmware upgrades and different operations on the devices before selling them. With time this creates a lot of serial COM ports on the systems so now many applications cannot use them. We have COM ports 40+ installed on a machine. We are deleting the new devices each time, this works for a while but now Windows is incrementing the number and reinstalling ALL of them each time we reconnect the Bluetooth adapter, even if we delete all of them. This in endless... What I did last time, deleted all entries in registry that refers to BTHENUM (Bluetooth perpheral enumerator). This makes Windows forgot entirely all Bluetooth devices and I reinstalled Bluetooth core components from scratch. This eleminates ALL traces of old COM ports and used devices. Now my problem is this one : Windows started to create a new COM port at 40 to establish the new connection and we cannot use this port number, too high. Below 40 cannot be installed. So Windows seems to remembers the last used COM port number and start the new communication with this one. Where in the registry is the information about the last used COM port number and is it possible to reset the value to COM3 for example instead of COM40 ? This can maybe solve our problem if it's possible to do. I hope my story is clear enough... Thanks a lot for your support and help.