Windows 7 taskmanager parameter incorrect

[chriske]

I cannot start taskmanager by right clicking on the toolbar and selecting task manager
then I got an error saying the parameter is incorrect

neither does ctrl+shift+esc bring up the taskmanager
and even ctrl+alt+del and choosing taskmanager does nothing at all

I am doing this as a standard user and not as an administrator

Windows 7 x64 Build 7100