There many virus that make your task manager disable. In order to get rid of them you need to scan your computer with an updated anti-virus and once the virus has been removed you need to re-enable your task manager manually.
For Re-Enabling your task manager you can choose one of the following way:-
A) Through Group Policy
Go to "Start" -> "Run" -> Write "Gpedit.msc" and press on "Enter" button.
1. Navigate to "User Configuration" -> "Administrative Templates" -> "System" -> "Ctrl+Alt+Del Options"
2. In the right side of the screen verity that "Remove Task Manager"" option set to "Disable" or "Not Configured".
3. Close "Gpedit.msc" MMC.
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B) Through Registry setting
Only if you are not using Windows XP Professional,Operating System then you'll need to edit the registry manually.
Click Start, then click Run, type in regedit, and click on OK.
Expand these registry keys in turn:
HKEY_CURRENT_USER
==>Software
==>Microsoft
==>Windows
==>CurrentVersion
==>Policies
==>System
After that Right Click on the DisableTaskMgr item,Click on Delete, confirm that you want to delete, and Task Manager should be available once again
**Warning**
Always backup your files before modifying registry entries
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