You have a computer running Windows 2000 Professional. You have purchased a new USB scanner. You attached it to the USB port. When you go to device manager to see the status of the USB port， you did not find any USB controller there. What should you do to resolve this problem？（）

A.Update the scanner drivers using certified drivers
B.Enable the USB port in the computers BIOS
C.USB keyboards DO NOT exist
D.Enable the USB hub controller
E.Reinstall the USB device driver and disable the USB error detection

A.Modify the portable computer’s power management settings to ensure the USB ports are not  shut down when the computer is running on battery power. 
B.Modify the portable computer’s BIOS settings to disable ACPI when the computer is running  on battery power. 
C.Modify the portable computer’s undocked hardware profile, and enable the USB root hub. 
D.Disable the BIOS power management features in the portable computer’s BIOS settings. 
E.Obtain external power supplies for the user’s USB devices. Ensure that these power supplies  are connected when the portable computer is undocked. 
F.Undock the portable computer, and reinstall the drivers for the USB port.

A.In scanners and cameras in control panel， remove the color management profile.
B.In the display properties in control panel， set the Windows color scheme to Windows standard.
C.In the advanced properties of the display properties in control panel， remove all color management profiles.
D.In the display properties in control panel， increase the colors setting.