Click the Install software prerequisites link as shown in below image :
The screen appears, it list the products which will be installed :
* Application Server Role, Web Server (IIS) Role
* Microsoft SQL Server 2008 Native Client
* Hotfix for Microsoft Windows (KB976462)
* Windows Identity Foundation (KB974405)
* Microsoft Sync Framework Runtime v1.0 (x64)
* Microsoft Chart Controls for Microsoft .NET Framework 3.5
* Microsoft Filter Pack 2.0
* Microsoft SQL Server 2008 Analysis Services ADOMD.NET
* Microsoft Server Speech Platform Runtime (x64)
* Microsoft Server Speech Recognition Language - TELE(en-US)
* SQL 2008 R2 Reporting Services SharePoint 2010 Add-in
See Below Image :
Click the Next button to go to the next step.
Accept the license agreement and then again click on Next button.
The installation begins.
At the end you must obtain a report confirming that the installation is complete.
Finally Click Finish to close the wizard.