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Maybe, you have a problem with task manager when you will kill process and other, this problem maybe disabled from administrator  or virus malware, so i'll give tips for enable the task manager using .bat application. here it's :

1. Open Notepad.
2. Copy the code given below and paste it.

REG add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System  /v  DisableTaskMgr  /t REG_DWORD  /d /0 /f

3. Save the File as .bat. example : versado.bat
4. Run versado.bat as Administrator, and check your task manager,. you can using shortcut CTRL ALT Del

Create a Registry(.reg) file for enabling Task Manager
If you are unfamiliar with manually editing the Registry, you can create a Registry file which will automatically modify the Registry Key to re-enable Task Managing. To create one such file:-

1. Open Notepad or any other text editor.
2. Copy the code given below and paste it as it is in it.

Windows Registry Editor Version 5.00 [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System] “DisableTaskMgr” =dword:00000000

3. Save the file as Enable Task Manager.reg or *.reg.
4. Open the file by double clicking on it.
5. Registry Editor will ask you for confirmation. In the confirmation Window, click Yes.
6. Task Manager would immediately be accessible. If it is not, restart your computer.