The drivers for Windows 2000 & XP r exactly the same.
Same code, same build, same flavour.
The problem with supplying new drivers for new OS's is that Microsoft changes the way the drivers interact with the OS.
It happened with Windows 2000, Windows ME and now it happened again with Windows XP...
I'm used to work with Microsoft Operating Systems since MS-DOS 3.3 and I never jumped into the upgrade wagon until I was pretty shure that my HW and Peripherals complied with a new OS.