Vundo is a trojan that shows irritating pop-up advertisements and secretly downloads harmful files onto your PC. Because Vundo can run lots of advertisements, Vundo can severely decrease your system memory and slow down your computer. Vundo spreads through emails with links to insecure websites that exploit security holes of Internet Explorer. Once you click on a link in a Vundo-laced email, Internet Explorer launches a site that secretly installs the trojan into your computer. Vundo can run every time you startup Windows.

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