I log on with administrator, when I pressed ctrl+alt+del, give error "your task manager was disabled by administrator"; How can I enable it?

Solution 1: click start • click run • enter gpedit.msc in the open box and click ok • in the group policy settings window o select user configuration o select administrative templates o select system o select ctrl+alt+delete options o select remove task manager o double-click the remove task manager option

If Sol. 1 not help then try this:

Solution 2: click start -> run. Type in "regedit" (no quotes) and hit enter. Search for hkey_current_user -> software \ microsoft \ windows \ currentversion \ policies \ system. Look for: disabletaskmgr. Click on reg_dword. Value: 1=enable this key (disables taskmanager); value: 0=disable (actually enables taskmanager) close regedit reboot your machine.