GT-I5800 Problem with "Unlock Sim"
 

I got a Gt-I5800 mobile phone and I want to change the sim with another one I have. Since it is lock from the provider I have to break it. But since it is my first time and so Im totally noob Im asking for your help.

I download samsung 3g tools (if they are needed at all) but when Im trying to start the program it appears an "Error Card Not Found"

What I have to do?

aaaaaaaaaaanyone? :/