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And ya, you might want to mess with your resolution. I don't know the specifics on fixing resolution issues, but you can probably try your eqclient.ini file and make adjustments there or run the eqconfig.exe program (or whatever it is called in the eq directory) and change the resolution there. Also, maybe even changing your desktop resolution or setting EQ to run in windowed mode might help.
You could possible still have dual core issues, but normally they don't crash instantly after selecting a server. You might want to try some of the other solutions on the thread below. Upgrading to SP3 can help, or running in compatibility mode. And if you are using an AMD processor, you should get the AMD Optimizer program.
http://www.eqemulator.net/forums/showthread.php?t=25327