screen randomly turns black whilst playing

[pharmakos]

it gets fixed by hitting alt+enter to switch to fullscreen, but its pretty annoying. sometimes it will happen a few times in a row, and sometimes i'll get disconnected while switching to/from full screen.

it seems to be connected to some sort of graphics overload or something? seems like it'll be triggered when a new particle effect occurs. the light on my monitor will switch from green to orange for a sec, then when it goes back to green everything else in windows will reappear... but my EQ client's screen will be black.

i'm using a pretty crappy computer.... acer aspire one 255 netbook.... intel atom n450.... only 1gb of ram... windows 7...

any know any easy fixes that don't require purchasing new hardware?