Alo, Lázaro.

>How instance a object COM in VB.NET and after use methods it ?
>
>My object COM is a .dll

Just right-click on you project into the Solution Explorer, select Add Reference, then, in the Add Reference dialog, select the COM tab, and look for your Dll or TLB with the Browse button.

.NET will create a wrapper class that exposes your COM component as a native class.

Hope this helps,