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What does this virus error message mean?

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I was on the computer for a while and then my internet said this:

''Your browser was hijacked! Some results was changed by porn advertising! You need to clean your system immediately to prevent it. Download the newest antispyware software!'''

For one, this has never happened and I don't look at porn so this is creepy.

I have Norton Protection Center and Spybot Search and Destroy running. Norton hasn't come up with anything but Spybot has come up with something that says my Windows Security Center was disabled...

I'm really confused..? Can anyone make sense of what I'm saying and help me out??