network does not work my vista

I installed Windows Vista on fresh HDD, with all drivers correctly installed, I make all settings for network (IP, Gateway, DNS) but network don't work. All that in user with administrator profile. When I check network connection with Vista program, appear a message that say my modem (Webstar) don't work. In XP is working very good. Also, when I choose protocol Windows Locator, that don't remain set. Please give me an idea what to do. I deactivate User protection from Control panel. Again, don't work my network. -- Flopol RO