Why won’t my Sony Ericsson phone transer files to my computer?

I just got a Sony Ericsson w350i buzz two days ago that came with a USB and when i plugged it in to conveying some pics I have, my computer keeps on saying there is not anything plugged into that USB port even even if it shows up. My buzz is on, set to file conveying and i have downloaded the Sony Ericsson Media Manager 1.2 and PC Suite.

running on Windows Vista 32-bit.

Please help.

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