Antivirus 360 is a rogue anti-spyware program that uses false scan results and aggressive advertising in order to promote itself. This rogue is advertised by the Vundo Trojan and is replacing the Antivirus 2009 rogue program that Vundo has been aggressively advertising. If you are infected with the Vundo Trojan you will see a large amount of pop-ups stating that your computer is infected and that you should install Antivirus 360 in order to protect yourself. If you click on the ad, Antivirus 360 will be downloaded to your computer and you will be prompted to install it.
How to remove Fake Software (pop-ups), Spyware, Trojans and Viruses:
Download, install, update and scan your computer with both Malwarebytes and SuperantiSpyware, delete what ever they find, if this fails to completely remove the virus/spyware download then update Avast and run a boot scan (click schedule boot-time scan and restart your PC), all the software below is free and safe to use.
Malwarebytes: http://www.malwarebytes.org/mbam.php
SuperantiSpyware: http://www.superantispyware.com/
Avast Anti-Virus: http://www.avast.com/eng/avast_4_home.html
To protect your PC in the future you'll need to install anti-virus software and a firewall, id recommend using Avast and Comodo Pro firewall both are very effective and completely free, you should also switch to Firefox 3 if you are browsing with IE as its much safer and a lot easier to use. (links on my profile)