Marcelo please start a new help topic here in Installation and Setup as this topic which you located by google is six months old and pertains to the beta version of Windows 7, so people who will want to help you may ignore it.

Are you using the RC 7100 now? What version of Windows 7 do you have and where did you get it? If it is a retail copy of Windows 7 it includes free tech support from MS or your manufacturer, who can also help you work through these issues.