Sony Ericsson Xperia X10 Mini Pro

My phone is the Sony Ericsson Xperia X10 Mini Pro. To get videos from my phone to the computers at school I must have my USB connector cable. To get it on the computer you must plug one end in the phone and the other in the computer. To get the file on the computer you must drag it from the phone into a folder on the computer. My phone stores the videos as mp4 files.