help plz

ok i am looking for a good gaming computer heres what im starting with
emachines:windows vista home basic with SP1
AMD athlon LE-1620 processor
NvIDIA geforce 6150 integrated
Dvd+rw super multi-format dual layer optical drive
160 gb hard drive
2 gb ddr2 memory
15-in-1 digital media manager
logi tech mouse and speakers
emachines flate pannel moniter e191h tft lcd-18.5 widescreen 1666x768 16:9-aspect ratio 5ms response time
Vga analog input
any tips and helps would be nice i need to know what to get to make it better and at a reasonable price starting with the cheapest up to upgrade the items would be nice

 

Let's start by addressing a few important things:

First and foremost, what model of eMachines is it? I'll need that information to look up Motherboard specs and find out what your abilities are.

Secondly, what's the most high-end PC game you're looking to play (that will help me set a benchmark that you need to meet or pass).