What's wrong with my comp?

Games & Technology
I can run D3 on low settings and fullscreen just fine until I get to parts with mass mobs, then I to extremely low fps. I'm not really good with computers so I was wondering if anyone could help me figure out why I'm getting this massive lag.
Here are my specs
Processor : AMD Phenom(tm) 9600B Quad-Core Processor 2.31 GHz
RAM : 4 GB
System type : 64 bit
ATI Radeon HD 4300/4500 Series
Graphics memory : 2808 MB
Disk space : 931GB

Please let me know if you need more info.
I appreciate your help :)
Seeing your CPU and graphics card, it's normal to see such low FPS. They are both too weak, especially the CPU.
How much would a decent upgrade be, and what would you suggest buying?
Well, I would recommend that you get a whole new computer (but recycle the hard disk and DVD drive). :X

If that is impossible for you, see if your computer has a PCI-E 16x slot / and a decent power supply. You can list your PC model and I can look it up for you.
Not sure what model it is because my mom the comp for me a few years ago for my birthday and it's a "custom build" from Comp USA. I guess I'm screwed then.

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