So, OK. This is my thinking.
If it is a serial device piggybacked onto USB then there is a chance that the drivers are 16-bit, in which case you’re bollocksed on a modern system. You can “thunk” (genuine technical term, I’m not making this up) 16-bit drivers on a 32-bit system, and 32-bit drivers on a 64-bit system, but 16 on 64 is right out.
If the modern PC identifies it as a USB device you can go to its Properties in Device Manager, pick the Details tab and change the property view to Hardware ID. This will give you a bunch of strings with increasing detail. You’re looking for something like USB\ROOT_HUB&VIDxxxx&PIDxxxx
– google that string.