Windows XP, service pack 2 <--- Good, Vista Blows for Games
Pentium 4 CPU 2.80GHZ <---- I have About the Same, Not To Great .
I would recommend a Duel Core Processor, Your Video card Needs a Good processor to Pump its Max, Duel core will Do that
1.50GB RAM <--- If thats DDR2 Ram, Your Set...