I have been unable to connect to my PC via USB since the computer insists on not recognizing the phone as a USB Mass Storage Device but only as a Samsung USB Composite device. Multiple installation/reinstallation of the Media Manager and drivers did not fix the problem.
However, I have now SOLVED my problem.
I installed the Samsung PC Studio 3 and its drivers. Altho this program does not recognize the phone as connected, the PC now recognized the phone as USB Mass Storage and therefore the phone looks like a disk drive in Windows Explorer. Pictures, mp3's, whatever, can just be dragged and dropped into it and the evil Media Manager can be dispensed with.
Whatever drivers it installed worked and I am a happy camper again.