At bottom right of my screen I have a solid red circle with a white x in it, it appeared after an ad

from Pest Control. A bubble appears from it every 10 seconds or so and reads that 'Your computer is infected' then tells me that I should click on it to download antispyware. I have installed Norton anti virus and also Microsoft.com, window defender, they all say that I have no virus or spyware, but, the box says I have. How do I stop this thing popping up every 10 seconds, then it fades, then re-appears with a 'pop' sound - it's driving me crazy! Any help much appreciated.

At bottom right of my screen I have a solid red circle with a white x in it, it appeared after an advert?free antivirus download

Download this program. It will fix that problem http://www.superantispyware.com It is VERY VERY effective and it is free.

At bottom right of my screen I have a solid red circle with a white x in it, it appeared after an advert?internet security

Recommendations:

-Download hitmanpro, www.hitmanpro.nl.

-Start/run/msconfig/start up: see if unknown programs are started at setup. If so, google them up.

Also:

http://www.delphifaq.com/faq/windows_use...

might be specific your spyware.
Adaware, spyware blaster,internet eraser, ccleaner, avast, zonealarm. oh yeah and McAffe site advisor these are all free from:
first remove norton and get a real antivirus then remove the crappy windows defender that doesnt even work get a free scan at trendmicro
dont for any reason click on it... there are some steps you can take for this to go away but dont click on it for any reason...