Hello imaphaggit, welcome to PCHF.

Some PC's already have the facility to do this, if you have an extra vga port at the back of your PC, you can normally duplicate the display from your display properties.

Otherwise, there are two ways of doing it.

The first, and easiest way is to buy a VGA splitter: VGA Splitter 1-2 (Box Adapter) 400MHZ

The second, is to purchase a graphics card that has two VGA ports, but the type of card you buy will depend on what hardware you currently have, and will require you to open your PC and install it. An example of such a graphics card: NVIDIA's GeForce 6600 GT AGP graphics card - The Tech Report (normally cost around $50 from ebay). The advantage of having a replacement graphics card is that (by all probability), you'll most likely be having an upgrade at the same time.

One movie on two monitors you mean? Have you actually tried plugging the second monitor in, it normally does this automatically? If not, you can right click on your desktop and go to Properties. Go to the Settings tab, and right click on monitor 2, followed by Attached.