Security Essentials: Microsoft’s free anti virus software

There are lots of free anti virus software which you can find through search engine. Maybe you know some of them, but have you known Microsoft provides anti-software too ? Have you tried it ?

Microsoft Security Essentials is a new, free consumer anti-malware solution for your computer. It helps protect against viruses, spyware, and other malicious software. It’s available as a no-cost download for Windows XP SP2 and higher, Windows Vista, and Windows 7.” – From Microsoft.

Actually some years ago we heard about Microsoft Security Essentials, But seems it was not free? not sure, but if it was free before, we should have known it more.

OK, Where to get it ?

1: You can visit the official site directly:

2: If you just finished a new Windows 7 installed, you might have seen a red X remind on the right bottom status bar: Click “Open Action Center”:


In the next screen click “Open Action Center” and let it “Find a program online”, then you will be navigated to Microsoft’ security provider web page (if you are using Windows 7, the page should be here)

Then on the right side, Click “Downloads and more” button.


Then you will come to Microsoft Security Center:


Click “Download ….” link then come to the place which is the same as in above 1;

Download the proper version which is for your Windows version:


After you download, start to install it:


Make sure turn on “Firewall”:


The next is its real installation, you have to wait some while …

Later, it asks you restart computer so that extra installations can be continued…


After you reboot, you will see Microsoft Security Essentials try to update and then scan your computer, you have to wait some time again …


After the scan finished, you can set it such as schedules:



Firewall can not turned on, ICS Service can not started, and internet disconnected – Rootkit tdl3 !!

IF you found your computer gets the the following problems, please beware of your computer most like is infected by a super virus !!

A windows XP SP2 PC, one day when it was booted up and was found the following problems:

1: User could not access to internet, Local network icon with a tooltip message : local network limited or no connectivity;

2: The firewall could not turned on – click button to turn on, no worked;

3: ICS service can not start: Even you go to Control Panel and try to start the service Windows Firewall/Internet Connection Sharing (ICS) Service by manually, it still did not work;

We checked lots of related resolving method such as Release socket, and also installed several virus clean tools, but nothing was helpful.

Finally we found right place to get the resolving solution: It is because a super virus ! Rootkit tdl3 !!

About Rootkit virus information, we will find more information later to post, here we just give the information how to clean this virus.

There are many of various Rootkit viruses, so maybe your computer inflected by another kind of Rootkit, but our information is for reference.

Actually, all we need is just downloading a great tool: Combofix.exe (if you installed Combofix.exe before, you should uninstall first and then use it again.) , Please put this tool directly to your desktop , DO NOT put in any other folder.

OK, actually the detail information should from here (Derek Microsoft MVP/Windows – Security ), Please read carefully before your use Combofix tool !!

For your convenient, I copied part of Derek’s post to here below:

 Delete any existing version of ComboFix you have sitting on your desktop

**Note: It is important that it is saved directly to your desktop and run from the desktop and not any other folder on your computer**
1. Close/disable all anti virus and anti malware programs so they do not interfere with the running of ComboFix.

2. Close any open browsers and any other programs you might have running

****Note: Do not mouseclick combofix’s window while it’s running. That may cause it to stall or freeze ****

Actually, our computer has lost the internet connection, so when Combofix.exe asked us “Recovery console is not installed, do you want to install?”, we selected Yes but of course it could not download anything, but doesn’t matter, you can still continue.

After 2 times reboot during Combofix.exe working, finally the Rootkit tdl3 virus gone away from our computer, The firewall was on again, and internet connections recovered again. Thanks Combofix.exe and Derek !

Hope this article is helpful for you ! Good luck !

(There is also another tool : GMER)