First I'm sorry for my bad english ,but I want to ask if anybody know a decompiler for a dvb project (project made in vb for autocad)This project is also password protected.
I'm searching for that kind of program to decompile a project for almost a yeat but I have not results.
Thanks in advance

DVB files are just regular VBA projects. You don't need a decompiler. The code isn't compiled because VBA is an interpreted language. Your problem is simply that the DVB is password-protected, so that you can't view the code.

Try searching for "dvb" and "password" within the autodesk.* newsgroups:
http://groups.google.com/groups/search?q=dvb+password+group%3Aautodesk.*
The signal-to-noise ratio isn't very good, but there are some useful responses in there, eventually.

More likely than not, the tool you're looking for is called vbakey.