Simple Fix!
As you may or may not be aware of, there exists a small compatibility problem between the Mac Pro and the recommended installation procedure for XP service pack 2 using Aplle’s BETA boot camp applications. The problem degrades a single modern SATA hard drive performance from 60-100 Megabute/s throughput down to a mere 3792 Kilobutes/s. If you are currently running XP on your Mac Pro, you will mostl likely have this problem.