This spyware is a trojan horse. What that means is that once a computer is infected, it will download other potentially harmful software and install it on the victim's computer.

And if that wasn't enough; Vundo will make your computer slow on purpose and offer you software to make you computer fast again.

If you do not want to be a victim of a scam, you should never buy software that a program offers you. You should do your own research and find what is best for you. Ask friends, visit forums, read reviews.