I have a video, how do I transfer it to my pc?

The transfer of your mobile phone video to your pc depends largely on your mobile phone. Most video enabled phones offer several ways to copy a video clip from your mobile phone to your computer.
USB

Some phones allow you to transfer your video from your phone to your computer through a USB cable. With USB enabled mobile phones, you often get a computer program to use your phone for different purposes, among them transferring data (video, photos, ...) to your computer. If so, install the software on your computer, plug in the USB cable, and you're ready to go.

Bluetooth

The same functionalty is often available using Bluetooth – note that, in order to use Bluetooth, you'll need Bluetooth on your pc. You can use either the built-in Bluetooth connection of your pc, or (if you don't have Bluetooth built-in) a seperate USB Bluetooth adapter.