Windows Defender inaccessible!



I'm new here and I have a question about Windows Defender. I'm using Vista
and Defender came with it. The problem I have is that I can no longer access
Defender, from anywhere. Clicking on the icon in the tray or the start menu
doesn't produce a window. Defender gets updates and seems to install them.
Yesterday it gave me a warning about possible harmful programs and that's
when I found out I have no access. Can someone please tell me in easy to
understand terms [I'm a novice when it comes to technical lingo] how to fix
the problem? I'm grateful for any help any one could give. Thanks in advance.

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