TIRED OF VIRUS!!!!! What is the best low price defence :(?

[Vikki2796]

ARGH the amount of times I've had virus' on this stupid laptop it's like it attracts them with a magnet from all over the world with a huge sign saying INFECT ME!!!!!!
I don't go on games websites, I only go on YouTube, Facebook, Gmail and Yahoo answers and google when I'm searching for something. Yet still it tells me that I have virus'
I don't have one at the moment (for now) but I think I know ones gonna pop up in lets say about a few weeks because my laptop is retarded like that.
So I want to buy an antivirus that has protection against everything virus' throw at me. Trojans, worms THE LOT!!! I'm fed up of them and want them gone! But I don't want to pay hundreds I'm only 14 and barely have any money right now so is there anything around £30 that is effective and works. I've gone through AVG, Windows, avast (absolute pathetic I got the work load of virus' with this one with people trying to hack my emails and facebook), norton. EVERYTHING!!!!
All the free crap never works so I want something that can do the job and stop these assholes FOR GOOD! So I'm looking for
Around £30
Effective
Protection against most/all bad stuff
Lasts AT LEAST a year

Thank You and I look forward to your replys
Yes I'm obviously going to look at Porn when I'm only 14 :/ seriously look at the details and think before you put retarded comments like that