If you haven't already done so then read this:
http://www.eqemulator.net/wiki/wikka.php?wakka=EQEmuFAQ
Graphics drivers, screen resolution, directx version, dual & quad core cpu's are the more common causes of what you are describing. A note on directx, even if you are running dx10 or dx11 you may still need to install the dx9c runtime components which can be downloaded from microsoft. The need for dx9c when using dx10 or 11 is on a configuration by configuration basis. It does not erase dx10 or 11 it merely adds the runtime components to the OS.
The graphics driver crash where it says it resets your display adaptor is a known nvidia issue. There were actually atleast two errors revolving around that...one was just a message saying there was a problem when there really wasn't a problem and the second problem was the display adaptor actually crashing. Nvidia had fixed both problems at one point then they turned around and screwed up their fix.
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