Vista - Security center box keeps pooping up!?

My antivirus that came installed on my vista computer expired I guess because I kept getting allthese notices aobut it, so I clicked on i and it took me to a website to buy anitvirus 2009 for 50 bucks. I did that and got a registration key and entered it and everything seemed ok. But then aobut every 15 minutes or so, the security center box will pop back up on my screen interupting whatever I am doing. If I am typing, it minimizes my paper and brings up the box. If I am playing a game, it minimizes the game to show me the box, which often results in me becoming dead. What is goig on and how can I stop this. Thanks.

Which anti-virus program is it?

If your antivirus program is really called Antivirus 2009, then you have fallen victim to one of the most common scams around, causing problems everywhere... Antivirus 2009 is malware! You need to uninstall it, according to the instructions here:

How to remove Antivirus 2009 (Uninstall Instructions)

Where did you get the machine and which Anti Virus software came prepackaged with your machine? Despite the fact that you just threw away $50.00, you might be able to recoup some of that money and get yourself a real AV app...

I'm angry for you, so I'll wait till you respond to continue...

Damn this Zlob Trojan!

This "Windows AntiVirus 2008" and "AntiVirus 2009" garbage is catching millions of unaware users these days through believable (for less savvy users) social engineering techniques. It has turned into one of the worst offenders recently and it's netting them millions, no wonder that Malware has turned into a real Profession and a Business model for criminals like these.
I truly wish Criminal Codes everywhere would finally catch up to the Internet Scam world and start putting these criminals away for long periods. As it is right now, too many countries take a "Buyer Beware" attitude to dishonest software peddlars, so they basically have free reign to peddle this Malware infested garbage on whomever they can catch.

@jonandshan - Please post back so we can make sure you get this cleaned out and so we can turn you on to legitimate protection products and train you on how to avoid this in the future!!