Nicholas
Another way to access Event Viewer. Select Start, Run, type eventvwr and press the ENTER key.
You may need to show hidden files. Type Folder Options in the search box above the Start button and select View, Advanced Settings and verify that the box before "Show hidden files and folders" is checked and "Hide protected operating system files" is unchecked. You may need to scroll down to see the second item. You should also make certain that the box before "Hide extensions for known file types" is not checked.
In Windows Explorer navigate to C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Administrative Tools" folder. Are the shortcuts to Administrative Tools there?
If you select Ctrl+Shift+Enter does it bring up Task Manager? When Task Manager and Event Viewer become unavailable you need to explore the possbility of a virus/malware infestation.