Your screens suk ass.... Get a new graphics card, get an i7 processor, if that's a desktop why does it only have 250GB..... Upgrade the HD if you have the money, also if you have the money look into maybe a SSD.
At the least upgrade the RAM to DDR3 (My lappy had 3Gigs of it prbbly kik you comps ass), check if your motherboard is up to the upgrades and etc. And buy better one if needed, upgrade to Win7.
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Better speakers also =d