I have a Pavilion M7434n, with XP MediaCenter edition that came with my
computer.
It has 2 USB ports on the front and 4 on the back side. None of these
ports work with a USB 2.0 device. Any USB1 device plugged in works
fine.
The usual procedures have been done. (i.e. delete all USB device in
device manager etc.)
BIOS is up to date.
in Linux the USB ports work just fine