What upgrades should I make to my PC to make games playable?

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Nov 23, 2015
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I have an old HP Pavillion a6433W that I am wanting to upgrade to make games like Heroes of The Storm playable at low settings because right now I get around 30ish fps. I want to know what upgrades I can make to my PC for $100-$150 to at least have 60 fps on low settings.

My specs that I can find are:

Operating System: Windows Vista Home Premium
System manufacturer: HP
System Model: KJ385AA-ABA a6433w
Processor: Intel(R) Pentium(R) Dual CPU E2180 @ 2.00GHz, 2000 Mhz, 2 Core(s), 2 Logical Processor(s)
Video Card: VisionTek HD 2400 Pro 256mb
Memory: 4x1Gb sticks
System type: 32-bit
Power Supply: 250w
Motherboard: IPIBL-LB (Benicia)