Receiving PACTOR 1 with a soundcard interface is doable and, is implemented in MixW. Transmitting requires some tight timing which does not lend itself to a non real-time OS like Windows (in any flavor). The one transmit capable program that I know of is HFTerm which, unfortunately, only runs on Linux.
I have done it with a MultiPSK and PTT control. Not gonna happen with a vox keyed usb sound link with any OS.