Sorry. runing Windows XP. Problem started when I was trying to fix the USB problems, (see previous post). Window keeps poping up indicateing"generic USB Hub as malfunctions & exceeded the power limits of its hub port". Since I've been trying to fix this USB problem, now I can't power down the computer. Yes, I reinstalled the ports as advised. I can use the ports, but the power problem window pops up all the time.