We didn't design or manufacture that cable, so we don't have more drivers than the CD you were sent. It's an inexpensive, of the shelf cable that we provide as a convenience to our customers.
We have thousands of customers that have used this cable, using this CD. So what you are experiencing is unique. I realize that XP on a mac shouldn't act any different, but that's about all I can guess at.
All I can really say is to search online for the drivers. I'm sorry, but we don't have more than we pointed you towards. If you really can't get it to work, go buy another cable from radio shack, wal-mart, or just about anyplace that sells computers today. We'll refund your money for the cable if you really want to send it back. Any USB-serial cable will work, but be aware that 75% of them out there use the exact same driver.