My big thanks to all your replies.
Seems avast is the absolute best from all the reviews I read. Now I have it installed in my machine and currently enjoying it. I think it is fantastic, and doesn't use half as many resources, it even talks to you! Will see how good it is, and hoping it’ll work best than the first ones. But of course have to be extra careful and smart on what I do with my PC now cos av doesn’t completely guarantee pc protection. Sometimes it’s just hard to tell if the downloadable material contains virus, and this is why my pc got a problem before. Antivirus didn’t protect it, since I went ahead downloading materials that contains virus which I really didn’t know. I didn't blame av for my inability to foresee the consequences. Nobody is perfect as they say. Now, all I can say is to be super careful with my pc.
Well, I hope everybody here is enjoying their antivirus and anti-spywares, etc….