Stopsign appears to be Rogue software that purports to clean your system but in fact just generates false reports about what it’s doing, as well as possibly inviting other malware to take up residence.
Those commercials prey on people who know nothing about computers. Which is a lot of people.
My roommate buys stuff for her computer that she could’ve got for free. She bought some $100+ anti virus software and complained to me that it wasn’t working so I downloaded AVG for her and that cleaned up everything.
Just last week she told me she paid $40 for the new Internet Explorer. I told her she could’ve got it for free but she said that it was too complicated that way and paying for it was better.
There’s just a huge misconception about the ease of finding free software.