单项选择题
A.anti-virus definition file.
B.drivers installed.
C.release of the operating system.
D.security and software patches.
单项选择题 AuserreportsthattheWindowsupdatefunctionwillnotrunonthecomputerbuttheInternetcanbeaccessed.TheuserisrunninganoriginalversionofWindowsXPProfessional.WhichofthefollowingisMOSTlikelythecause？（）
单项选择题 WhichofthefollowingaretypesoffilesdownloadedduringanAutomaticUpdate？（）
单项选择题 AuserwhoisrunningWindowsXPProfessionalreportsthatthecomputermonitorstoppedfunctioningfollowinganinstallationofanupdateddriverforthevideocardandthatattemptstodeleteandre-installtheoriginaldriverhavenotcorrectedthesituation.WhichofthefollowingactionswouldbeBESTtocorrectthissituation？（）