I have a computer that has been working great until recently. We back up the system every night using an external WD Passport drive attached to a USB port. The USB drives are swapped every night and a full backup is placed on the one attached. All of a sudden a few days ago, when the drives are swapped, the computer becomes unstable. Anything you try to run appears to run but never comes to the desktop. You can see the processes in task manager but cannot interact with the programs. At this point, the computer will not shut down. You have to hold the power button until it goes off.
I have run checkdisk and have done a thorough hardware diagnostic with the utilities from Dell and all show everything is in excellent condition.
Also, if I eject the USB drive and don't insert another one everything works fine. It is only when I actually insert the next USB drive that the system goes bonkers. And another thing I just remembered, when you insert the USB drive, it seems to be being recognized as a "camer or scanner" in "My Computer" <-- It's Windows XP by the way.
I'm considering trying a different USB drive but I don't think that both drives would become problematic at the same time.