Microsoft® Windows® Malicious Software Removal

MS is releasing a good malicious software removal tool with upgradation every month.  It is a good idea to download and run this tool every month, even though we have Antivirus/Windows Defender.


Link:
http://www.microsoft.com/en-us/download/details.aspx?id=9905

Windows Defender has been turned off....

I have windows 8 64 bit professional edition.  Whenever I select the Windows Defender, it says "windows defender has been turned off....".   I did search in the Google "how to turn on windows defender", but that I did not get any helpful post.

Solution: a) first turn off your antivirus ( i have Avira free one).
b) go to control panel -> Action Center
c) select security tab
d) go to virus protection
e) view antivirus apps
f) select windows defender and turn ON
g) update the Windows defender and scan the computer.
h) once the scan is done, just turn on your antivirus.  ( windows defender will go off automatically).