I have a friends computer here, and recently he said that his Ipod and other usb devices were not working at all. Nothing happens when you plug a USB device into any of the ports. In device manager, there is an excalmation point next to each of the USB Controllers. It says, "Code 28. The Drivers are not Installed" or something to that effect. I tried to reinstall the drivers, and it dosent complete with either one of 2 errors. "Access is Denied" or "The Data is Invalid" I have tried to uninstall the USB controllers, then reboot, and let windows find new drivers, but the same errors come up. I even went to the trouble of getting a PCI card and installing that, and it still gives me those errors. If at all possible, I do not want to format the PC. Ive tried pretty much everything I can think of, and google is not really helping a whole lot. I really want to fix this, I have no clue whats wrong with it 
