Microsoft Security Essentials is the all way free to use antivirus, antispyware program released by Microsoft. The antivirus is free to use and not only for a limited time period but you can enjoy till your lifetime, even you may remember in your old ages and would memorize the security essentials which was installed in past times 
Well in order to keep your antivirus healthy you have to update its database and modules daily or whenever the update is available, but what if you don’t have an internet connection. Well you may be useless with other antivirus providers, but Microsoft Security Essentials can even update itself offline.
The solution to this problem is that when you want to install the updates offline you need to download security essentials virus and spyware definition executable file from below provided locations and just install it.
via Tech Salsa
