You mean "usbmrs11.exe" and "Usbrate.exe", right? yeah, i tried those, also the one for changing it on win7, no effect on the USB3.0 polling on either one (Its rock solid on 125hz, wont budge), And the USB2.0 ports are still all over the place, maybe the motherboard just dosent like xp?, can you try plugging your sharkoon into the usb3.0 port and see if it runs on 500hz? if it does, its prolly my xp

Also fire is never crap! , we all know it makes everything 10x cooler and faster!