On your phone, are you getting the USB icon in the Notification bar when your phone is connected to the computer?
It should also be showing the message when you pull down the notification bar that your phone is connected as a media device.
On your computer, is the phone showing up in Device Manager? Or in the system tray? If not, there's a problem with your driver installation.
You could always use Kies Air (stock app) or something like AirDroid:
http://market.android.com/details?id=com.sand.airdroid and just skip the wired connection.
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