Vundo is a Trojan horse that can make your life hell in several different ways. It can download programs that wreak all kinds of havoc on your computer. For example, you may see constant pop-ups and your desktop icons may disappear! But this isn't the worst of it.
Some versions of Vundo download a program known as a rootkit onto your computer. A rootkit gives a malicious individual complete administrative access to your computer. Without your ever knowing it, a cyber-criminal with a rootkit could rifle through your entire system, looking for your stored personal information!
This is especially dangerous if you've instructed your browser to save passwords to sites like PayPal or your online banking site. I don't think I have to tell you how this could get nasty in a hurry.
Moral of the story: don't save important passwords on your browser, and get some software that can defend you from Vundo and rootkits!
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