The non-profit has been down for a month and called me to resolve.   Network Solutions does not have a backup fo the files that old so suggest I find DNN 2.0 and overwrite the files - they think the site on an ancient windows server was hacked.  Here's the error message...

Server Error in '/' Application.

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Configuration Error

Description: An error occurred during the processing of a configuration file required to service this request. Please review the specific error details below and modify your configuration file appropriately. 

Parser Error Message: Could not load file or assembly 'System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified. (E:\0\1\157\118\1809933\user\1960601\htdocs\web.config line 57)

Source Error: 

Line 55:   </httpHandlers>
Line 56: 		<httpModules>
Line 57: 			<add name="ScriptModule" type="System.Web.Handlers.ScriptModule, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
Line 58: 		</httpModules>
Line 59: 		<customErrors mode="Off"/>

Source File: E:\0\1\157\118\1809933\user\1960601\htdocs\web.config    Line: 57 
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Does anyone have a zipped set of clean DNN 2.0 files I can grab OR can I download it somewhere?

I'm just trying to help this childcare resource get back running after they ignore their site for way too long :)

Thanks for the quick and precise response.   Hope the overwrite repairs their problem :)