Or put the driver on an F6 diskette instead of integrating it. Search for F6 on the driver CD or at Gigabyte's website.
What do you mean by "Xp over Vista"? Shall Vista stay on the machine? I've no experience with V, but of things go like W2k and Xp, this wound be the harder way. Installing the older OS first is easier, especially as Vista has a different booting scheme.