I have a Hewlett Packard Pavilion desktop PC, equipped with an HP OEM wireless keyboard and mouse. I want to switch to a standard wired keyboard and mouse. Even if I remove the USB wireless dongle and switch off the wireless keyboard & mouse, the system (Win 7 Pro 64) does not plug-and-play any wired keyboard and mouse that are subsequently connected - its as if new "Human interface devices" are somehow blocked. I can't identify any HP drivers or software specific to the wireless devices, and the HP forums don't seem to offer any information. Device Manger only shows a "HID-compliant consumer control device" and a number of "HID-compliant devices", so not sure what to try and delete. I'm normally quite competent at sorting out driver and device issues, but this one has me stumped at the moment. Does anyone have experience of these HP OEM systems?