OK, I am running WinXP on an MSI KT3 Ultra and have always had USB 2.0. However, I reformatted the other day and noticed that USB 2.0 wasn't working. I went to Windows update where the "Microsoft Usb Driver Version 5.1.2600.0" driver usually comes up for me to download. However, when I go now its not there. I have tried reformatting again, resetting my bios, etc.. and it still doesn't showup. I haven't changed any hardware so what happen to it??? Any ideas??