First Interstate Organization

I don’t know too much about a computer.  Of course I know how to use it, but I don’t know how to fix it or properly maintain it.  I have read that its not a good idea to download stuf from unknown publishers, but I have done this on occassion.  Obviously I have done this one too many time because I learned that my PC had been taken over by security tool.  Apparantly this is a type of malware that invades your computer and tricks you into thinking your computer is infected for the purpose of making you buy the recommended removal tool.  I leearned that this software isn’t needed, but one is that will remove security tool.