I remind certain thing. Which version Intel INF ? Original Intel INF has OHCI and UHCI problem. It installs wrong device driver. https://communities.intel.com/message/202179 newer Operating System has native INF, so they have not seen the problem. The problem was left by Intel still now. If you installed this wrong inf, you should delete inf (* deleting device can not delete inf) and reinstall device. It occurred some problems my X48 chipset PC PCI device and USB device. Does your USB device have no problem? You can get fixed version here. This is my Win2000 library site. http://w2k.flxsrv.org/wlu/wlu.htm