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I want to know if any antivirus software is installed or not...

I have observed that when we install any antivirus how it detects the presence of any other antivirus if its pre-installed on that machine ?

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it would help to know what OS you are running – Keltari Jan 27 '13 at 4:15

In Windows Vista and Windows 7 you can find out if antivirus software is installed by going to the Security Center

You can find the Security Center on Vista under Control Panel, and on Windows 7 it is the Action Centre. In both cases you will see a screen somewhat like this one:

Windows Security Center


Apologies, looks like the picture I found was a bit old and it's not named the "Solution Center", it's actually the "Action Center" which can be found by clicking on the little flag beside the clock in Windows 7...

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Use the EICAR test virus:

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Although most AV programs do, there are plenty that do not detect the EICAR test virus. – Keltari Jan 27 '13 at 4:14

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