Run the client in compatibility mode for WindowsXP SP2 or SP3
If the shortcut is to a batchfile, you might not have the compatibility tab.
You can fix this by directing the shortcut to eqgame.exe directly with the patchme syntax.
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In the shortcut, change the Target to: C:\Your-EQ-Directory\eqgame.exe patchme
If there is quotations in the shortcut, make sure patchme is outside of the quotes.
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Then just set the compatibility mode to WindowsXP Service Pack 2 (or Service Pack 3)