>I have no problem transferring images and videos from the iPhone into the PC. However, there is this video which is 483 MB and, for that one, the transfer never works. It ends up with 0 byte. I have tried several times and this cannot work. I have transferred videos from 280 MB. But, it seems if the video file is too big, I cannot transfer it. Is this normal? I can view the video ok on the iPhone.

I threw out itunes like MS-Explorer years ago. Move to itools. It's an excellent tool for iphone and freeware.