Upgrading CPU

I just got this Acer Desktop computer with this motherboard in it,

Acer AX1430G-UW30P

It has a AMD E-450 dual-core processor, this processor is not strong enough to support gaming, which is why I bought the pc. I got it two 8GB ram sticks which I thought to be the initial problem of the slow computing, it did help but I am now leaning towards the CPU being the issue, but I am sort of new to this all so how do I upgrade this CPU?

If you could help I would greatly appreciate it!

I can't seem to get the cooling tower off of the CPU, it is held down with what seem to be springs, on the top they have white caps with a hexagon shape
NOyg7gs.jpg
 
Just chuck out the mobo, and replace it with a good msi am3 board.
Ebay should have prices low enough for a phenom ii x4 965.
 
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