[paulgiamatti]

My first guess would be a corrupt installation, which probably means there's no quick fix and you need to just start over from the beginning.

If you want to try a quick fix, you could just recreate your EQLSUI.xml and throw it into your EverQuest\uifiles\default folder, but I highly doubt it's an isolated problem with just that one file. If you want to try anyway, open Notepad and copy + paste this into a new document:

<?xml version = "1.0"?>
<!-- Monolithic Parameter File -->
<!-- The composite section must come first and be followed by the schema -->



<XML ID = "EQInterfaceDefinitionLanguage">
    <Composite>
        <Include>SIDL.xml</Include>
        <Include>EQLSUI_Animations.xml</Include>
        <Include>EQLSUI_Templates.xml</Include>
		<Include>EQLSUI_EulaWnd.xml</Include>
		<Include>EQLSUI_SOESplashWnd.xml</Include>
		<Include>EQLSUI_ESRBSplashWnd.xml</Include>
		<Include>EQLSUI_MainWnd.xml</Include>
		<Include>EQLSUI_ConnectWnd.xml</Include>
		<Include>EQLSUI_ServerSelectWnd.xml</Include>
		<Include>EQLSUI_ChatWnd.xml</Include>
		<Include>EQLSUI_ChatOptionsDialog.xml</Include>
		<Include>EQLSUI_ColorPickerWnd.xml</Include>
		<Include>EQLSUI_CreditsWnd.xml</Include>
		<Include>EQLSUI_NewsWnd.xml</Include>
		<Include>EQLSUI_HelpWnd.xml</Include>
		<Include>EQLSUI_OKDialog.xml</Include>
		<Include>EQLSUI_YesNoDialog.xml</Include>
		<Include>EQLSUI_PollWnd.xml</Include>
		<Include>EQLSUI_OrderExpansionWnd.xml</Include>
		<Include>EQLSUI_WebOrderWnd.xml</Include>
		<Include>EQLSUI_SplashExWnd.xml</Include>
   </Composite>
    <Schema xmlns = "EverQuestData" xmlns:dt = "EverQuestDataTypes"/>
</XML>

Save it as EQLSUI.xml, and move it to your EverQuest\uifiles\default folder. Good luck!