Where it came from? Usually it comes just from browsing less than honorable and legit websites. Usually sites that have torrent files or illegal music downloads and places like that. Legit places like Facebook, youtube or FA will not infect your PC with Vista Antivirus 2012.
Is Spam!!!! Is a trick. Is called malware. They will infect your computer with a fake virus and force you to buy their product. Use Malwarebytes Free Version to remove it. Here is the link.
Oh, okay. I think either my nephew or niece gave me the infection. This thing actually worked. Thanks. :)
That's good to hear!! Glad it worked for you.