Do I have everything I need to get the MSI Nvidia Gtx 960 Gaming 2 GB PCI-E Graphics Card?

I have a lenovo 2561 H20S PC with Intel(R) HD Graphics. I don't know what the power supply is or where to find it. Any other requirements to get this graphics card?
Serial number ES10416993

Added (1). Windows 8 64 bit

Added (2). If I can't get this graphics card because of power supply, how can I change it? Or are there any other similar options for graphics cards that I can get?

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Check your case of your pc the PSU is the box inside the case where you plug in the main power cable. Into take a photo of it.

I looked up your computer, and it is not really made for upgrading. It is pretty much a very inexpensive computer. Sure, you could add a video card and power supply, but your RAM is really low, your processor ain't all that fast, etc. Perhaps just save the money and just buy a whole new computer that is more what you want. That's what I would do.