What video card do I need?

I have an acer extensa 5620/5220 series laptop . It cannot play any pc games because the CPU is really low (1.83 GHz) . What can I do to fix this? Get a new video card? download software? please help!!!!!

And what size/brand of video card do I need
 
You need to get a new laptop if you intend to game. There is nothing you can really do to make that into a gaming laptop.
 
If you intend to do any real gaming on a laptop. You will be spending upwards of $1,000 just to do so. It's much better to just build a desktop for the task.
 
'Gaming' on a laptop requires NVIDIA GT640M, or AMD HD7850 or higher.

As above, $1000+. A desktop version of this will cost you $500. (not counting huge monitors etc)
 
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