How can I enable my Task Manager in windows XP?

Please notice that you asked a Windows XP issue on the Exchange Server Admin, I suggest you post the Windows XP problem to Windows XP forum instead of Exchange forum in the future. Thanks for your cooperation and understanding. http://forums.microsoft.com/TechNet/default.aspx?ForumGroupID=561&SiteID=17 Meanwhile, Regarding your question, it may caused by some third party antivirus program or Group policy restrict. I find below links for your reference. http://www.windowsnetworking.com/kbase/WindowsTips/WindowsXP/UserTips/Customization/EnableDisableTaskManagerinWindowsXPHomePro.html http://www.softwaretipsandtricks.com/forum/windows-xp/33333-how-enable-task-manager-again-windown-xp.html regards, Jason