I think your three picture problem may be the result of accidentally turning on the "burst" mode somehow. Here is how you would shut it off.
As for downloading movies, does your computer have a slot for a camera memory card? If so, you might be able to take the memory card out of your phone and stick it in your computer. If you can do this, it should act just like any other hard drive and you could copy/past or drag and drop your movie files just like any other file.