I'm stuck again...
Now both my Mac and PC are in the same Network (Workgroup). From windows I can see my mac but when I click on it, only its printer and "printers and Faxes" icons appear. I can see my PC at that side column on Finder, but when I click on it, "connection failed" appears. If I click on the "connect as" button, comes the window: Enter your user name and password to access the file server xxx. Connect as: Guest - Registered User. If I connect as a guest, it fails. If I connect as a registered user, I don't know what name and password I should use.
Obs.: When I'm at Apple>System Preferences>View>Sharing, there is no "windows sharing" in the service column.
What now?