Task Manager Disabled

Problem:
When you press Ctrl+Alt+Del, it shows Task Manager Disabled by Your Administrator.

Cure:
To cure this problem, simply open Run command(Start --> Run) and type gpedit.msc and hit Enter. Then you will get the following screen:

(Most probably, your Run command would also have been disabled. In that case, open Start-->Programs-->Accessories-->Command Prompt. Then type gpedit.msc there and hit Enter to open Group Policy).OR

Group Policy

Here you will find RemoveTask Manager and all. Now what you will do first enable the feature by double clicking on the option and selecting the enable option and then again changing back to Not Configured.
Now see your task manager is back.