If you have any viruses, then you may notice that they affect to the task manager and disable it..This is because if we know that there is a virus active in our background there’ll be a chance to stop it using task manager.
Disable task manager was done by viruses editing the computer registry.
Here i explained how you can fix and get back the Task manager again.
Method 1:
Click Start >> Run >> and type the code below and press Enter.
REG add HKCU\Software\Microsoft\Windows\CurrentVersion\Pol icies\System /v DisableTaskMgr /t REG
Method 2:
Click Start>> Run>> and type Regedit.exe (open registry editor)
Navigate to the HKEY_CURRENT_USER \ Software \ Microsoft \ Windows \ CurrentVersion \ Policies\ System .
In the right-pane, delete the value named DisableTaskMgrClose Registry editor. You may want to restart your computer for changes take effect.
Method 3:
Click Start >> Run >> type gpedit.msc (Open Group policy editor)
Navigate to:User Configuration / Administrative Templates / System / Ctrl+Alt+Delete Options / Remove Task Manager .
Double click the Remove Task Manager option.Change the policy to Not Configured and click ok
