I dont know what is happening.
I made a full backup for my project folder. I made a backup for the SQL server database mdf files. Then I formatted my PC and reinstall the Visual Web Developer 2010 Express. I copied the files back with the same folders names and structures to my Disk storage.
When I started the Visual Web Developer 2010 Express and start opening the files, I got alot of organic statements errors that were not there before. Everything was running sucessfully before making the formatting.
Sample of errors:
Error1:
<%@ Page Title="Login Screen" Language="VB" MasterPageFile="~/MasterPages/MasterPage.master" AutoEventWireup="false" CodeFile="LogonScreen.aspx.vb" Inherits="Logon_LogonScreen" %> E:\ASP_Projects\TrackingDesk\Logon\LogonScreen.aspx: ASP.NET runtime error: Reference assemblies for target .NET Framework version not found; ...

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