I have Windows XP insralled on both my laptop and home PC. I have run into a few instances where, no matter what I did, I couldn't get something to work right. Long story, short version, I formatted the disk and re-installed XP and my backup folders. The problem may have been caused by a virus, a bad install, a bad remove of some software. Something, somewhere, got messed up, no way to determine what it was. My printer is attached Through a USB port.