Conficker, also known as Downup, Downadup, Kido or the Microsoft Worm began spreading in October 2008. By January 2009, it had affected 16 million computer around the globe which included hospital system and sensitive military systems. The worst part of it is that Microsoft had already released a patch for the vulnerability Conficker has been exploiting even before the release of the worm.
Here are some of the ways and tools that can save you from the effects of Conficker worm.
1- First of all go to the windows update site and make sure you have all the critical and security updates installed and your Windows is up to date. If, for some reason, you can’t update Windows, at least you should have the following updates installed.
Just click on the name of your operating system and download the security update and install it.
2- Make sure you have an updated and active real time antivirus.
3- If you get affected by chance, remove the conficker worm using one of the following tools:
Symantec Conficker Removal Tool
4- Here is the Microsoft Knowledge Base Article that includes manual removal instructions about the Conficker worm.
And here is the complete detail about the Conficker worm, about it’s functioning and how it spreads: