my windows Defender (7 home pro editiion) seems to have been deleted. How do I re - install?

My computer had been attacked by a virus of type copycat, posing as a microsoft security program and who want my credit card information.  When I contact MS tech supported the representative asked permission to take ober my computer so he could repair and eliminate the problem.  He said that it was a common attack and could takei care of her.  He did, although it took some time.  However, when he was finished computer HD has more Windows Defender and I don't have a working firewall.  It does not show that it is when I go into the control panel to see if it has been removed.  When I look in the Control Panel, I get an error message saying that it can't find it.  How can I get it re-installed.  I try to go to the download page of MS/Windows and can't loacate everywhere I t is available for download for Windows 7 Home Pro editiion.  Can someone help me please?

Windows Defender is part of the Vista operating system.  She may have been disabled, but I don't think he could have been uninstalled.

What AV program do you use?  See following which applies to MSE, but aspects of this link could certainly apply to other AV programs as well: MSE and Windows Defender

Windows Defender is disabled by AVG, McAfee, MSE, Norton and several other AV programs for conflict prevention.

http://Windows.Microsoft.com/en-us/Windows-Vista/turn-Windows-Firewall-on-or-off

I hope this helps...

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