Windows 7: Safety Service Center problem. help!

Hi, I use Windows 7 and now I have a problem with Safety Service
Cente. When I opnen it I see a red mark and if I click on "Active
now", it is impossible to active it. I am not able to do it.
What can I do please?
I don't know fine Windows 7.

PS: do you know an interesting newsgroup or forum on Windows 7?

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