Bogus software mistake

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The other day I mistakenly downloaded a program called cyber security without realizing it. I thought that the message I got was from windows because the way they worded it made it sound like windows had detected a virus and I need to rid of this virus by continuing. Without thinking, I continued and halfway through the download I realized that it was an outside organization and tried to stop download, to no avail. Now, every 3 minutes I receive an annoying popup from them telling me I have x amount of errors that need to be fixed etc etc. I also keep getting shutdown by windows due to this unregistered software installed and they tell me to make sure in anti virus software is working, and it is..(McAfee) (I wonder why McAfee didn't pick this up?) Anyway, I want to delete the program but it does not show up in all programs..How is that possible and how do I get rid of it and their annoying pop ups..Never again will I be so quick to click on something but like I said, they totally tricked me..Any help out there is really appreciated..Thanks