Microsoft .NET Framework 4 (Web Installer)free download: DOW NLOAD System requirements Supported Operating Systems: Windows 7, Windows Server 2003 R2 x64 editions, Windows Server 2003 Service Pack 2, Windows Server 2008 R2, Windows Server 2008 Service Pack 2, Windows Vista Service Pack 2, Windows XP Service Pack 3 Windows Vista with Service Pack 2 or later (all editions except Starter Edition) Windows 7 Windows Server 2003 with Service Pack 2 or later (all editions) Windows Server 2003 R2 or later (all editions) Windows Server 2008 with Service Pack 2 or later Windows Server 2008 R2 Hardware Requirements: Computer that has a 900 MHz or faster processor RAM: 128 MB RAM 25 MB of available hard disk space