Well, I kinda know a thing or two about computers and such.
The trackmate controller is a serial interface, db9.
the computer has a USB port.
You need an adapter, commonly called a USB-Serial adapter to connect the two.
The USB Serial adapter needs to have a driver installed (do not assume it is natively driven by windows). This is why I now ONLY buy one brand of these (tripp lite).
(NOTE: https://www.amazon.c...22-d605505c9d1e)
You install the driver for the adapter, then the adapter will have a serial port number (com1, com2, etc) assigned to it.
Several years ago, I had some projects with USB's and there's a thing called USB serial port enumeration - BASICALLY - pick one port to plug the adapter in, and KEEP IT IN THAT PORT. It will then always get the same serial port number. if you plug it in a differnt port, it will change numbers.. If you use USB hubs and change ports on them, or change hubs, it will get different numbers. (This is not fun, so avoid it).
To see what serial port it is, go into Device Manager, under the section marked "Ports (COM & LPT)" and you should have something that says "communications port (comX) [where X is a number] That is your com port.
Once you've done that, in the drag software, I believe it's in the setup or options, set the com port to that number.
You may have to restart the software, but you should be in business.