I have a p4 running xp pro. My USB wireless-modem would not connect till I reformatted the harddrive. Now, all is fine. However I notice the option in BIOs to ENABLE USB legacy device which is presently DISABLED. Is there a good reason to enable this option? Intel says a USB mouse wont run in safe mode without it enabled http://www.intel.com/support/peripherals/sb/cs-011939.htm. But, my USB mouse does work in safemode with it disabled. I thought maybe this had something to do with the wireless-modem not working in the 1st place. Maybe a resource conflict and reformatting fixed the conflict?