What is Spybot - Search and Destroy?

I don't know how I got it on my computer. Is it safe to run?
Update: I'm thinking that the guy that worked on my computer could have installed it, but I went to use it and it was showing some strange things in a scroll bar while it was "running the bot" or whatever it says and it just freaked me out and I closed out of it. Listen, I am getting pop-ups. I have my... show more I'm thinking that the guy that worked on my computer could have installed it, but I went to use it and it was showing some strange things in a scroll bar while it was "running the bot" or whatever it says and it just freaked me out and I closed out of it. Listen, I am getting pop-ups. I have my blocker set to on. I have avast antivirus... what is the best thing to do?
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