Help with FPS increase

Can anyone tell what computer parts, I can change to get a noticeable FPS increase, I usually have 45 in a 5v5, so i would like to increase that to about 80-100, at least.
heres my specs:

Manufacturer: HP-Pavilion
Processor: Intel(R) Pentium(R) Dual CPU E2160 @ 1.80GHz (2 CPUs), ~1.8GHz
Memory: 1916MB RAM
Hard Drive: 490 GB
Video Card: NVIDIA GeForce 7100 / NVIDIA nForce 630i
Monitor: HP w2007 Wide LCD Monitor
Sound Card: Speakers (Realtek High Definition Audio)
Speakers/Headphones: Logitech Headset
Keyboard: USB Root Hub
Mouse: USB Root Hub
Mouse Surface: N/A
Operating System: Windows 7 Ultimate
Computer Case: N/A

OT:I didn't know where to put this thread

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