hardware advice:

[Drenivian]

For a cheaper upgrade, I'd just suggest 2 512 sticks for the 1gig and finding an oldish video card.  I'd say nVidia 6000 series.  That should only be, at most
$125.
That should suffice until you are able to outright purchase or build a better, more spectacular pc.
I play on a 2G processer with 2gig ram and a nVidia 6200.  nothing spectacular, but enough that i don't went crash anymore.
dren
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