I was trying to hook up a Lexmark All-In-One printer to my Windows XP (service pack 2) Dell computer. I disabled my anti-virus and anti-spyware as well as disconnect my printer and external hard drive so there would be no conflicts. While installing the Lexmark software and drivers, I kept getting a bubble that it didn't recognize the USB device. According to Lexmark's own Knowledgebase, one should "Disable the USB Enhanced (USB 2.0) Controller" in the Device Manager when you get this message. I followed the instructions exactly and now my mouse and keyboard are completely disabled and I am unable to log in to my computer. I get as far as the screen where you choose the account you want to log into. How do I reconnect the USB Enhanced Controller and regain control of my mouse and keyboard? THANKS.