I've used the same cable and software on XP 64bit, Vista 64bit, and Windows 7 64bit. All went smoothly by following the same setup instructions provided by Blazt (more or less).
I've since swapped to XP 32bit for better compatibility between the OS and my laptops various options, for instance there are no sound drivers for Vista onward for my laptop.
I've found Blazt to be a invaluable tool at times. But I'm still awaiting Gary's (member: DVDBURN (MD)) new interface...