Computer Virus Security warning thing... how to get rid of.?

I keep getting a message pop up at the bottom of my screen saying Security Alert: NetWorm-i.Virus@fp which it tries to get me to download antivirus software, and i dont want to. But i cant get rid of it. I done a norton scan and it didnt find anything, i've looked in add and remove programs, adjusted my add ons in the internet options but still nothing! Please help!!

Computer Virus Security warning thing... how to get rid of.?auto protect

Be sure to fully update your Norton before scanning, it may happen that you have got some spywares, use Windows defender to get rid out from it.

http://www.microsoft.com/athome/security...

Note: - you should have a legal copy of windows before using this.

or try some for free, like "AD Aware 2007", "Spybot search %26 destroy"

available here:-

http://www.download.com/Spyware-Removers... (just scroll down the page)

Computer Virus Security warning thing... how to get rid of.?downloads

a-squared free download and run or e scan will do
It is a popular scam.

You have malware, not a virus.

The malware gets onto your computer, tells you that your computer has a virus which is not really there, and then attempts to get you to buy their antivirus software.