Not yet official is it, but Microsoft had already announced that they would be releasing their very own free security program for the PC.Named as Morro originally, was the program. It will now take the name Security Essentials in order to cover the general aspect that the software will do.
One's PC must certainly have essential software according to Microsoft. It is totally free, this is the next good thing about it all. Though still in beta mode, it surely will not be long until the full version is released.
Link: news Free Security Software from Microsoft