Need help upgrading to 2.1

[fongmac]

I downloaded the SamsungMoment_Update_MR4.exe file from Sprint. Ran the installation. Followed the instructions and got the moment to download mode. I get to the part where you connect the usb cable to the Moment and the pc. But instead of downloading nothing happens. On the bottom left of the screen there is a message "port detecting" and that's it, nothing else happens. Any ideas???