You may have the Task Manager disabled in your Windows 7 installation. This may be because of many reasons. For example, a malware can infect and disable the task manager in your Windows 7 installation. But you can easily enable it again. Here is how :
Method 1 :
- Press the key combination Windows logo key + R to open the Run dialog.
- Type gpedit.msc in the Run dialog and press Enter. This would start the Local Group Policy Editor.
- In the Local Group Policy Editor, navigate to User Configuration → Administrative Templates → System → Ctrl-Alt-Del Options as shown
- Double-click on Remove Task Manager and choose Enabled and click OK to save the settings.
Method 2 :
- Press the key combination Windows logo key + R to open the Run dialog.
- Type regedit.exe in the Run dialog and press Enter. This would start the Windows Registry Editor.
- In the Registry Editor, navigate to
HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionPoliciesSystem
- Double-click on DisableTaskMgr and change the value to 0.