I've got a Windows 7 Pro 64 PC with a FTDI based 4 port USB to RS232 converter. I've been having periodic problems with the port name (port numbers) changing. Most recently this occurred when the USB cable got accidently yanked out of the PC while connected to one device. The original port numbers were 3, 4, 5, 6. When I plugged the cable back in the ports were reallocated as 7, 8, 9, 10.
Does anyone have any ideas on how to prevent Windows from reassigning the port names / numbers?