Due to Internet browsing your PC can easily get infected with viruses, worms and trojanswithout your knoledge, and that can lead to system slowdown, freezes and crashes. Also insecure Internet activity can result in revealing your personal information. To get full advabced real-time protection your PC ant Internet activity, install an antivirus and antispyware software.

I keep getting this^ a lot while surfing, and pop-ups are telling me to upgrade, and that I have viruses on my computer. They're advertizing that I upgrade to a new blocker, but my dad says that it's just a scam, and I need to take better care of the websites I go to (it's only this, yahoo, and Youtube). My dad's not exacly "tech savvy" so I was wondering what I should do before it may be too late.

Your Dad is more than likely right in saying its a scam.
I've had many home users duped by some of these pop-ups before, you go to thier site, download their "free" software, run a scan and come back with about 100 or more "infections".
Panicing now that your current AV didn't pick these up, you send cash to these guys and you're not any better off, in fact you could be worse.
Ignore those pop-ups or block them if you can and stick with an established AV company that you trust would be my answer.

In the famous words of Admiral Akbar - IT'S A TRAP!!!!

Don't sign up for anything and if you have adware it's a real bitch to get off. Download a free adware scanner and see if you have it and can get rid of it. If not other options do exist.

Thanks, guys. My computer's getting a little slower, but I can try to ignore the pop-ups. Any other options (perferably free) if I somehow did have virses.

I had one of those pop-ups. I fell for it.

Don't do it RCTjunkie, it is horrible

They are scams.

They prey on the inexperienced computer user and sadly there are too many people who fall for them who just don't know better.

I just got AVG Free Antivirus, as a comprehensive solution, which seems to be working out so far. But i've never had problems with viruses before.