Hi, A few friends including myself bought these a couple of months ago and we have had nothing but problems with the mouse not being recognised on XP startup. The only way to get XP to see it again is to unplug and plug it into a different USB port. We are all experiencing the same problem and I just did a reinstall last night on a new mobo and still the same problem. Seems to do it with or without the Razer drivers. Running the lastest drivers and firmware. Its getting to the point where we are going just send the things back. Never had a problem with my MS mouse. Anyone else experiencing the same problems?