um im not sure if i put this in the right place so sorry if its in the wrong place but i reformated my computer and the usb ports dont work so i went to device manager and pushed update drivers but it didnt find any so i went to the manufactures site (hp) downloaded the chipset drivers and then tired again it worked but part way through installing it said usbehci.sys is missing and im not sure what to do to get it working correctly.......thanks for any help