EXPERT RESPONSE
This probably happened because of a Group Policy change. If you run GPEDIT.MSC and go to User Configuration | Administrative Templates | System / Ctrl+Alt+Delete Options | Remove Task Manager, see if it's disabled there. If so, re-enable it.
Another way to re-enable this is by editing the Windows Registry directly. If you go to HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionPoliciesSystem and set DisableTaskMgr (a DWORD value) to 0, that should also fix the problem. I would look at the Group Policy setting first, though, since that might be more directly responsible for making this happen.
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