Thanks people.
I gave up on it for the day, with many failures and only 1 success. The Canon Pixma MP500 XP x64 drivers installed and operate without problems. nVidia has drivers from nForce4 + in the "Beta section"; however, they don't come with an installer and the instructions are poor. Realtek also has Beta drivers. They won't load properly.
I was wondering: Why is it that when I right click the .INF files and choose "Install", I get the "Installation failed." error message every time?