I use Logitech cordless keyboards and mice on both my machines and never had a problem. I have however experienced problems with Window mis-detecting USB devices in general - for example on one machine with a Plantronics headset, and on the other with a Canon all-in-one printer with card reader. In both cases the machine failed to boot with the device connected, but the problem was not with the device itself. or its drivers, but with the USB root hub driver. Try removing all the USB components from the device manager (using your PS2 keyboard and mouse). Restart windows and let it re-detect the USB components. Then try reconnecting you Logitech keyboard and mouse.