How do I get this stupid Virus ad pop up off?

I know I most have looked at something I should not have, but anyway There is a small upside down yield sign, that has an exclamation point in it.

Some tomes it pops up and reads about I have a trojan, then it pops up as I have spyware.

At first I hade a added green tool bar, well I ran from microsoft a cleaner ( free) it took that of . But still have these pop ups. "Trojan -Spy. Win32@mx" Everytime I can close them or If open it all it is is an ad for Spyware remover . example Virus Heat or Virus Ranger etc...

I do not have the money to buy that stuff.

Is there not a trully free cleaner or something to get rid of this?

How do I get this stupid Virus ad pop up off?best antivirus software

Two things can do this smitfraud %26 vundo both require a tool to remove, you got this from gonig onto an unsafe site.

Smitfraud removal:

http://www.bleepingcomputer.com/forums/t...

Vundo removal:

http://www.bleepingcomputer.com/forums/t...

When clean download free McAfee SiteAdvisor so you know which sites are safe.

How To Remove Virusheat (removal Instructions)

http://www.bleepingcomputer.com/forums/t...

How do I get this stupid Virus ad pop up off?firewall

Automated free way to remove it