popup help

Within the last couple day days, I must of downloaded something that has put spyware or some shit on my computer
Its going way slower then it use to, and almost every time I click ANYTHING while in my browser, it makes a popup. Even just clicking the tweet button to tweet something new when I'm already logged in, and sometimes it happens 4-5 times before I finally get the tweet box to pop up instead of a popup.
I even bought adblock thinking this might help. Well it BARELY helps.

I have norton on my computer..

Anyone have a suggest for a free adware spyware remover that works well?

This shit is annoying as FUCK

I think I figured it out.. somehow a bunch of extra extensions had been installed on my chrome browser >_>
I could see how people would make a killing off infecting computers with that shit. Now that it's removed I can see how much it was doing.... it literally added an advertisement window to the top and sides of every page, on top of the constant pop ups. Dude prolly made $20 off me in the last day just from my clicks lol

format your computer then install

malware bytes
avast free antivirus
personal firewall

and you'll be good

In addition to the Malware Bytes suggestion above, have a look at Sandboxy if your computer won't do Virtual Machines. It prevents problems.
Also, CCleaner. A user account in Windows instead of an Admin account for your daily stuff might help to prevent things too.

A firewall or antivirus will not prevent things like these.
Antivirus is overrated, a firewall has another purpose, that's why. The antivirus looks for patterns in the code but can be easily excluded by less than honest people. A firewall just monitors who your computer talks to.

On a lesser computer I will ditch my antivirus but keep my firewall. Windows firewall is enough if you stay in the good neighbourhoods of the interwebs.

For good measure I would reinstall my OS. Once hacked you can never be sure you deleted all evil.