Computer help

[pho]

tried playing starcraft online a little while back, and i lagged

i thought to myself WTF? starcraft is an old game, so it doesnt need much to make it run fine, but yet my computer lagged while playing online

my computer ran fast, i always kepted it clean, my net was fast, i have a dsl connection, so i wanted to know why it lagged, i noticed there was a performance icon thing in my control panel so i clicked on it

and this is what it tolded me

click here for bigger pic


MY computer scored a 1 in gaming graphics, WTF!!!!!!!!!!!!!
everything else seem to be running fine

IM a noob when it comes to computer hardware, so i was woundering if anyone knew how to fix this?

or maybe recommend and kind of graphic card or something like that? if that is what i need, then can someone tell me or show me tips for what kind of specs i need to look for when im shopping for one?

or do i need a video card or something? (i have no clue what im talking about)

if this helps any, i think this is a newer version of my computer
http://www.bestbuy.com/site/olspage....=1156607399506

here are some specs
Type: General Purpose, Value
Processor Family: Intel 5 Series (Pentium 4)
RAM: 512 MB
Storage Capacity: 160 GB
RAID: No
Graphics Card: Intel Graphics Media Accelerator 900 GM

The a1120n is another inexpensive Media Center from HP without a TV tuner: If you can live without TV, the Pavilion a1120n is a good PC for students and home users toting iPods and digicams.


Media Center Edition OS in a sub-$1,000 package. Seamless integration between HP?s mul-timedia apps and MCE. Nice 17-inch LCD.


No PCIe or AGP expansion slot. Ball mouse.

i knew i should of bought a dell, thanks for any help