Sometimes you can get infected without your knowledge. Vundo trojan is distributed by spam email messages. You can’t be infected by opening the message, however if you click on a link given on the email, Vundo can be secretly installed to your computer. Vundo can be installed only because of Internet Explorer vulnerabilities, so you are pretty safe if you use any other web browser. However, you should avoid opening emails from strangers and clicking on suspicious links.
Vundo is installed secretly, but its activities can clearly be seen. This trojan displays a lot of commercial pop-ups and slows down a computer noticeably. If you suspect you can be infected with this, use vundo removal.

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