What is a possible situation when it might be necessary to boot Windows 7 from a USB device, a CD, or a DVD?

What is a possible situation when it might be necessary to boot Windows 7 from a USB device, a CD, or a DVD?

  • to disable background services
  • to delete registry keys
  • to partition the hard drive
  • to repair the system
    Explanation:

    Disabling background services, deleting registry keys, and partitioning the hard drive do not require rebooting a PC. It might be necessary to boot a computer from a USB drive in order to repair the system in some situations.