Hi , you have installed a port of the nexus firmware , and need nexus drivers installed on your comp.(fully read the opening post of your chosen rom) as the samsung i9000 ones are now no use: http://androiddrivers.net/samsung-android-drivers/download-nexus-s-drivers/ if that driver does not work you could install the android sdk(just google it )
I don´t understand it well but I have tried install this driver and the pc has blocked. Also I have installed the driver using the SDK (C:\Android\android-sdk\extras\google\usb_driver) and It doesn´t work. what can I do?