I Need USB2 Driver for XP to my INSPIRON 1520 Laptop

Hi 4 all

I have INSPIRON 1520 laptop,

when I install VISTA my USB ports is HIGH SPEED 2.0 with no problems

and I got:

Enhanced Universal PCI to USB Host Controller

But when I install XP, its NOT USB2

I got "Standard Universal PCI to USB Host Controller"

and when I plug High-Speed Device I got message says that the port is not High speed or something like that.

even the Copy to my USB-Flash in VISTA is faster than in XP

I think I tried ALL the DELL Drivers in "Drivers & Downloads" but still same!

Any suggestions?

thanks