Vista - Antivirus 2008

I don't think Antivirus 2008 is installed on my notebook, I'm not sure, but there's a security balloon in the notification tray saying "You have a security problem!". Also antivirus 2008 webpage keeps opening. its getting too irritating. I'm facing this problem since 3 days now.
Kindly help..

What does it say when you click on the balloon? It should tell you if it is your antivirus or firewall or both that is not running and give you the option of running them if installed.

On clicking the balloon, the antivirus webpage opens and asks for installation. It keeps asking to scan the pc for virus.

This is normal for most antivirus installations. It want to scan your pc before installing. Allow it to scan.

If you have never scanned your pc almost all antivirus programs will cause the security baloon to pop up until you run your first scan.

But isn't antivirus 2008 a fake antivirus? I already have an antivirus(NOD32) and an antispyware(SUPERAntiSpyware). Both of them haven't solved the problem (and neither have detected any virus in the machine). All i want is that balloon to be removed and the webpage of antivirus 2008 never to appear again..
Please bear with me. I need help..

Its there. I used Avast, Trendmicro, S&D, and many others to slow it down. I got rid of it but not the other trojans installed with it. I ended up backing up and reinstalling.

how do i get rid of it?? is it harmful?

Antivirus 2008 - from Wiki-Security, the free encyclopedia of computer security

Let me know if that doesn't help. Didn't have the time to read the whole article but it gives a link for removing it.

The main problem with Windows Vista | Defensive Computing - CNET News

This was the worst virus I ever fought in 25 years. I am glad it did not hit my corporate network. After a week of fighting Antivirus XP 2008 and all the associated Trojans, I decided it was time to backup my data and reinstall the OS from scratch. I booted the OS DVD and removed the OS partition. Shutdown. Restarted and reinstalled. Then, patched. Left my user in user level security and UAC is on. It would probably be better to do the same.