Disable Task Manager in Windows

Open notepad then copy this script

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

then save *.reg ( e.g. regedit.reg ).

or

Click Start, Run and type regedit.exe

HKEY_CURRENT_USER \ Software \ Microsoft \ Windows \ CurrentVersion \ Policies\ System

delete DisableTaskMgr