How do I get “Security Tool” pop-ups off of my computer?

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So I was just on my computer when this “security tool” gets onto my computer. I have never heard of it in my life. It keeps on giving me pop-ups ever 10 seconds!!

I tried to download Malwarebytes but this security tool won’t let me!

I NEED HELP!!!

Computer security: Parents, teenagers take risks online – The Christian Science Monitor

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NEW YORK – Big companies such as Citigroup and Sony have been the targets of major hacking attacks … by computer security company GFI Software . More than half of the parents whose home computers have been infected with a virus said this has happened …
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What’s an ideal minor for majoring in Computer Information Systems and Security?

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I’m currently attending a University and pursuing a B.S. in Computer Information Systems and Security.An ideal career I’m looking at is a Criminal Investigator (Cyber-Tech).

I originally thought about minoring in psychology (online social engineering, human-computer interaction, etc), but then I thought about minoring in Criminal Justice.

Which minor would be more appropriate for a career as a Criminal Investigator (Cyber-Tech)?

my computer thinks i dont have any security software even though i do.?

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i own vista and it is saying that i need to get software for security. my computer already has mcafee. anything i can do to make it know i have software?