I don't have any ISA cards.....haven't for a long time, but, I do know that there was talk of limiting ISA support in XP.....I read something about it in a review somewhere but I can't recall where!;( I don't have a clue if this is your problem or not......did you try just re-ing the driver for it manually? Maybe someone here has an ISA card and XP loded?......I hope for your sake!😉 Good Luck!🙂