To connect and transfer a file via USB:
1.Connect the USB cable to the computer and the phone.
2.In the phone: When you attach the USB cable to the phone, you are prompted to choose between Phone mode, PictBridge and Mass storage.
3.Select Mass storage.
4.On the computer: Open My Computer. Your phone will be visible as a removable disk.
5.Double-click the removable disk.
6.Here you will find specific folders (depending on your phone model) where your files are stored.
7.Drag and drop or copy and paste the file from the appropriate folder to/from a folder on your computer.
8.Disconnect the phone from the USB cable.
9.The file is now transferred to/from your computer.
http://www.sonyericsson.com/cws/support/phones/detailed/issueswhentransferringfiles/w302?cc=gb&lc=da