Hi mubarak_07,
No one is responding to you because of the lack of details in your question. I'm guessing that you are asking for an anti-virus software / program for your computer that is running Windows. If this is this case, you can download Microsoft Security Essentials for free (it's always free) from here - http://www.microsoft.com/security_essentials/
Hope this helps! If you provide more details we can help further.
Cassandra
Microsoft Windows Outreac