How can I stop pop up add about antivirus software?

Sounds like you have a trojan virus. They cause pop-ups to open browser windows and they install a program telling you that you have a virus!!! I had a very annoying one that the guys on http://www.bleepingcomputer.com helped me to get rid of. Do a virus scan, run spybot search and destroy, Lavasoft AdAware... they will tell you if you have been infected. If you are you will need to download "Hijack This" and then post the log onto http://www.bleepingcomputer.com/. They will walk you through the pretty easy process. All the above programs are FREE!

Spyware programs did nothing to permanently remove the trojan for me. I had the vundo trojan. It kept self-replicating after I had used every known spyware and antivirus program. HiJack this and killbox work great!

How can I stop pop up add about antivirus software?anti virus

Microsoft have started doing a windows defender that can download from there web site and they also have a tool to stop pop ups.

How can I stop pop up add about antivirus software?auto protect

Get a spyware removal programme. Superantispyware, Ad-aware,

Spyware Terminator. Or others.

All available from download.com.
Go with Gar on this.Superantispyware is brill.Run it in safe mode and it will get those nasties you don't want on your PC.Free as well,that might be the best part.
Check your pop-up blocker is enabled, then if you're still having problems, follow the advice given from the other players.
(1) Get you self a good antivirus or a free one .