Unable to access the Task Manager and no. icons work

My computer can not access any programs like when I click on them, they don't open.

Then I tried Ctrl-alt-del and it took some time. The screen became black and said failure to display the closing and security options.
Please help I run on windows 7
And also is it a virus or not?

See if you have the same problem, if you create another user of Windows and test with it.

You can also try the system restore since you seem to eliminated all Virus problem.

How to repair the operating system and how to restore the configuration of the operating system to an earlier point in time in Windows Vista (or 7)
http://support.Microsoft.com/kb/936212/#appliesTo

Tags: Windows

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    Visit our Microsoft answers feedback Forum and let us know what you think.
    If this post can help solve your problem, please click the 'Mark as answer' or 'Useful' at the top of this message. Marking a post as answer, or relatively useful, you help others find the answer more quickly.

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