I understand that you are wishing to sync contacts from your computer to your iPhone 4S. Here is some relevant information on how to do so:
Contacts, Calendars, Bookmarks, and Notes
You can sync contacts, calendars, bookmarks, and notes with other applications on your computer. This allows you keep all your information in sync across multiple computers and iOS devices. The settings for these items are all in the Info tab for your iOS device in iTunes. With your iOS device connected to the computer, select your iOS device. Then click the Info tab.
"Whatcha gonna do Brother?"