单项选择题
A.Update the scanner drivers using certified drivers
B.Enable the USB port in the computers BIOS again.
C.Contact the maker or vendor for you system and obtain the current version of BIOS.
D.Enable the USB hub controller in device manager.
E.Reinstall the USB device driver and disable the USB error detection
单项选择题 YouhaveacomputerrunningWindows2000Professional.YouhavepurchasedanewUSBscanner.YouattachedittotheUSBport.WhenyougotodevicemanagertoseethestatusoftheUSBport，youdidnotfindanyUSBcontrollerthere.Whatshouldyoudotoresolvethisproblem？（）
单项选择题 YouhaveacomputerwithaUSBkeyboardthatisrunningWindows2000Professional.YouinstallaUSBscanneronthissystem.Thesystemasksforthedriverandyouinstallthem.Afteryourestartyourcomputer，younoticethatthekeyboarddoesn’tworkanymore.Whatshouldyoudoinordertomakeboth，thekeyboardandthescannerwork？（）
单项选择题 Youarethenetworkadministratorforyourcompany.AuserreportsthattheUSBportsonhisWindows2000Professionalportablecomputerfunctiononlywhentheportablecomputerisinitsdockedpositionattheoffice.HeasksyoutoconfigurethecomputersothattheUSBportworkswhentheportablecomputerisdockedandwhenitisundockedandrunningonbatterypower.YouverifythattheportablecomputersupportsACPIpowermanagement.Whatshouldyoudo？（）