This article describes how to install DotNetNuke 4.9 easy way. It describes all the required steps to install DotNetNuke in step by step. This article shows all the setting that is required with snaps.
How to Install Dotnetnuke?
1). Download Source code of Dotnetnuke from http://www.dotnetnuke.com/tabid/125/default.aspx
2). Extract the ZIP file of Dotnetnuke source file in to X:\Inetpub\wwwwroot\Dotnetnuke.
3). Right click on Dotnetnuke Folder, and go to Security tab, and Click on Add, and add the NETWORK SERVICE user as shown below.

4). Create new Database as Dotnetnuke.

5). Open DotNetNuke_VS2008.sln from x:\Inetput\wwwwroot\Dotnetnuke\.

6). Change release.config to web.config from your solution explorer.

7). Change connection String appropriately.
For SQL server 2000/05 connection string is:
<connectionStrings>
<!-- Connection String for SQL Server 2000/2005 -->
<add name="SiteSqlServer" connectionString="Server=.\SQLDeveloper;Database=DotNetNuke;uid=[user];pwd=[password];" providerName="System.Data.SqlClient"/>
</connectionStrings>
For SQL Server 2005 Express connection string is:
<connectionStrings>
<!-- Connection String for SQL Server 2005 Express -->
<add name="SiteSqlServer" connectionString="Data Source=.\SQLExpress;Integrated Security=True;User Instance=True;AttachDBFilename=|DataDirectory|Database.mdf;" providerName="System.Data.SqlClient"/>
</connectionStrings>
8). Press F5, it will show the installation screen in web browser. Select Auto and press next, will install Dotnetnuke.


9). Next is Installation status screen.

10). Click on “Click here to access your portal.

11). Login with host/dnnhost or admin/dnnadmin. Its default user/password.