What happens when you pay for the security protection virus?

You do realize its a virus right?
If you buy it, it will install other programs like it to get more from you and redistribute your information on the black market

If you pay for it ...the details of your cc will be compromised and you'll have to call your credit card company and have them issue you another card.....

Here is the removal instructions for Security Protection.........

http://www.bleepingcomputer.com/virus-removal/remove-security-protection

It takes over your machine and will continuously send out details all round the Internet, and will keep asking for more payments. Download the free scanner from http://malwarebytes.org and run the full scan.

assuming you use a credit card then the scum who produced this crap will take your credit card number and charge the living hell out of it. DON'T PAY!!!

The criminals who make this fake AV will have your credit card details to do what they want with, empty your account if they want.

Are you referring to those fake anti-viruses?
If you pay for them you loose your money and gain nothing.
Infact when you notice one of them remove asap as they can install other viruses/malware and steal important documents/files, misuse your pc, etc... oh and they will slow you down.

Google whatever the infection is called and find a guide on how to permanently remove it, whilst looking perform the following.
Download MalwareBytes free edition asap and run a full scan.
Download Avast Free or Microsoft security essentials and keep one of those as a full time anti virus, also run a virus scan using one of them.