XP SP3: I deleted all the USB drivers in Device Manager until I had no KB or mouse! (I was following directions but I own the problem.) No PS2 ports; serial devices not recognized. Optical drives are first boot device but multiple XP SP3 won't boot. I can get to Setup/Bios, Safe Mode and into XP but, ... No input devices in any. I pulled the HDD and can place it in a working XP SP3; is it as simple as repopulating a directory? I've been trying to find a way to resolve for weeks; I'm about to give up. THANK YOU for even considering helping! J