“Security center alert” popup is a false security alert from fake antispyware Perfect Defender 2009. This “Security center alert” popup reads:
“Security center alert. Do you want to block this suspicious software? Name: Trojan.Zlob.G; Risk Level: High; Description: Trojan.Zlob.G is a trojan program that records keystrokes and takes screen shots of the computer, stealing personal and financial information.”
This “Security center alert” popup is supposed to scare you into wasting money on Perfect Defender 2009. You may have caught this “Security center alert” popup through a fake video codec, or a drive-by download.
Unless you like getting scammed, don’t download the software the “Security center alert” popup links to. The only spyware you’re infected with is fake anti-spyware that you need to remove.

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