at hxxp://www.dvddecrypter.com/index.php?act=news
you can read:

"I'm guessing it was cracked (not sure what!), played with, something - because the setup exe is not the one I released. I just hope everyone running it has checked their machines for viruses / spyware etc! "

It looks dangerous that DVD.Decrypter.v3.5.2.0.WinALL-HLWITYTN

it reminds me an infamous non existing crack for a program called GuitarFX 3.04 whose all_over_the_net_spread_crack is a corrupt exe. The zip contains another exe who forces your pc to connect to some strange site.
All the Astalavista sites own that false crack.

Fear the Greeks and his gifts.....

PS: the only protection of this GuitarFX 3.04 is the fact that it needs get connected to the internet to start up (some seconds after you can stop the internet connection if you want). It has never been defeated...