Manually install Microsoft Security Essential Definition Updates
Microsoft Security Essentials is a free antivirus and antispyware program for windows which provides real-time protection for your home PC that guards against viruses, spyware, and other malicious software.
Once you installed Microsoft Security Essentials (MSE), you would need to update it with latest virus definitions which requires around 40MB download.
If you are facing any problem (like internet problem, updates stops…) while trying to install definition updates for Microsoft Security Essentials Now you can manually download and install latest definition updates from Microsoft.
You don’t have to play with your MSE to update it (as other antivirus program does). All you need to do is just download the latest definition updates (46Mb) and double-click on it (Mpam-fe.exe) to install. Done!.
Download Microsoft Essential Latest Definition Updates [ 32bit | 64bit ]

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thank you for helping me with my security problem.
James Phelps
November 23, 2009
its my pleasure.
Akshat
November 24, 2009
this ink doesn’t work any more
Is there somewhere else I can download from!?
Zoe
January 11, 2010
@Zoe the above link is working perfectly fine.
You can just right click on above link->copy link location-> paste it in your address bar.
If you still have any problem then tell me
Akshat
January 13, 2010