FrankT said:
Well let's see...
- CPU: Intel(R) Core(TM) i3-3220 CPU @ 3.30GHz
- CPU Speed: 3.3 GHz
- RAM: 4.1 GB
- OS: Microsoft Windows 8.1 (build 9200), 64-bit
- Video Card: GeForce GT 620; Pixel Shader v5, Vertex Shader v5, 2 GB Dedicated Video RAM
- Sound Card: NVIDIA High Definition Audio
- Free Disk Space: 154.9 GB
I take it from your graphics card that this is a desktop machine. Can you remove the side panel and get a look at the motherboard? If you can see any free slots you can ascertain whether they are PCI or PCI-E(xpress). This is important as the two aren't compatible with each other. PCI-E is more flexible because it comes in different sizes (x1 being the smallest and x16 being the largest) but x1 cards can fit in any size PCI-E slot.
Take a look at this picture from Wikipedia of the different types; the top four slots are PCI-E and the bottom is PCI. If you can see any of these free on your motherboard you will know what you are aiming for. The rest of your specs seem fine for standard definition capture.
EDIT: If you can see the label on the top your hard drive whilst you're looking for available slots, if you can see a model number write it down and let us know and we can check out the specification of that too.