I have a Dell GX280 XP Pro sp3, and I get the error "USB Device Not Recognized" when trying to add a new Canon PIXMA MP470 Printer to my machine. This is the second printer and second cable. The first printer was an HP and it gave the same error. I have tried the registry hack to add DWORD key DisableSelectiveSuspend" with a value of 1. I have tried powering off my system and removing the power cord for over 15 minutes. I have uninstalled all usb devices in device manager as I can until it kills the mouse and keyboard. I have reloaded the OS and haven't installed any other software or updates and I get the same error, even before the drivers were installed. As soon as I turn off the printer the "Unknown Device" is removed from the device manager. I read in one post that someone was told how to fix this, but didn't post it. I followed the install procedures to the letter and have even done a complete format and reload of XP from scratch and I still have the same problem. Just to let you know my history, I have been working computers since 1975. I know my way around a system and have built many in the past. This just seems like an odd problem and by the looks of the blogs all across the net, people have been having this problem since 2006. I really would like some help. Does anyone have a solution to this?