WinXP & USB 2.0

I would like to know if Windows XP has the USB 2.0 stacks built into the OS yet — so that users can access the hi-speed USB data rate of 480 Mbps if they have a USB 2.0-compat. PCI card installed?

The reason I ask is b/c about 4-5 months agowhen I tried to get a USB 2.0 PCI card for my former Windows Me box, I was told that even with the PCI card installed, I would not be able to get the hi-speed transfer rate since at that time Microsoft had not yet released the USB 2.0 stacks.

Therefore, again is the current release of Windows able to take advantage of USB 2.0’s 480 Mbps rate?