Hi Tokomk,
I write you in english because i don´t know portuguese :(.
Which version of Converter are you trying? there is the v4 out ready to run...you can try that one.
You can try a hot convertion: the machine you want to convert...leave it running and try to convert to your ESX or VMWAre Workstation.
If you are trying with cold convertion (CD) be sure you put the correct IP settings (use the same as the machine you are trying to convert).
IF none of this works...you can try to do a ghost or image of the server (acronis, symantec...) and import it on the ESX box.
I hope that helps...regards
Andres Prieto