Scotty,
I believe I have a virus on my computer and it has frozen up.

It says that the FBI froze my computer for looking a pornography which is not true. I went to the Internet on my cell phone and it said that this is a scam and do not send these people any money.

They wanted $300.

Google search said do not send these people any money. It said that they put a virus on my computer.

Is there anything you can do to help me?
___________

It is doubtful that anything has been installed on your computer. This is a scam. It is designed to frighten you into thinking you should hand over money. You are wise not to fall for it. If you feel your computer is behaving in a way other than normal then I would be happy to take a look but more than likely this is just a pop up menu or a website making threats. In the older Windows XP world, it was very possible for a person to install a virus accidentally by clicking links, viewing, attachments, visiting websites, but luckily the modern Mac is not as vulnerable.