There are two types of video capture devices you can install on your computer. External video capture devices connect an analog video source to a computer by USB and an audio cable. External video capture devices are relatively inexpensive and easy to install. Internal video capture cards must be installed inside a computer. They're more expensive than external video capture devices, but they often have features that external devices lack.
It's important not to confuse a video capture card with a graphics card. There are many high-end graphics cards without any video capture capability, so read the product packaging carefully to determine what features the card has. It's also important to ensure that the video capture card is of a type that can be installed on your computer. Check your computer's documentation to determine how many PCI and PCI Express slots it has available. Also, take care not to confuse these two types of slots; they are not interchangeable. Also, find out if the video capture device comes with video editing software. If it doesn't, and you don't already have video editing software on your computer, you will need to invest in a program with video capture capabilities. Also, make sure the video capture device is compatible with Windows Vista before making your purchase.