I faced the following error when clicking on Documents and
Lists, Create, Site Settings and many others. Any one know how to
solve this problem?

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Description: An error occurred during the parsing of a resource
required to service this request. Please review the following
specific parse error details and modify your source file
appropriately.

Parser Error Message: Could not load
type 'Microsoft.SharePoint.ApplicationPages.StsLayoutsApplication'.

Source Error:

Line 1: <%@ Application Language="C#"
Inherits="Microsoft.SharePoint.ApplicationPages.StsLayoutsApplication
" %>

Source File: C:\Program Files\Common Files\Microsoft Shared\Web
Server Extensions\60\template\layouts\global.asax Line: 1