I have win 7 security 2012 on my computer?

I some how got win 7 security on my computer. It wouldn't let me open anything on my computer. I did some research and found out it was a scam. Tried following instructions to remove it without success. So, I discovered a registration code that worked and everything is running fine. I tricked it into thinking I bought he stupid thing. My question is now that I have this program and my computer is running normal, should I leave it on there or remove it. If I should remove it, how do I do so. I've tried several different programs that say they remove it and either don't work or I have to pay for it. When I go to my computer to uninstall programs it isn't''t even listed there...