Do I need a new processor to improve my graphics or do I just need a new graphics card?

Manufacturer: Dell
Model: Inspiron 1545
Processor: Pentium(R) Dual-Core CPU T4400 @ 2.20GHz 2.20 GHz
Installed Memory (RAM): 3.00 GB
System Type: 64-bit Operating System

I checked the ratings of my components and they came out like this (scale of 1.0 to 7.9):
Processor: 5.5
Memory (RAM): 5.5
Graphics: 3.9
Gaming Graphics: 3.4
Primary hard disk: 5.8

What do I need to do to improve the graphics of my laptop? Do I need to get a new laptop?

*Additional information: I live stream on twitch.tv and I want a good set up for gaming preferably on the computer I currently have. Some of the games I try to play have a lot of lag during the streams and I tried everything to reduce it, but I think it is just my graphics card isn't strong enough. If you want to check out my stream here is the link: www.twitch.tv/diirtyxweezy
 
This laptop is not a great gaming laptop. There's nothing you can upgrade on it. If you are serious about gaming, use a up-gradable desktop PC or be prepared to spend a great deal more money on a gaming laptop
 
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